ReactJS for Beginners provides an overview of ReactJS including what it is, advantages, disadvantages, typical setup tools, and examples of basic React code. Key points covered include:
- ReactJS is a JavaScript library for building user interfaces and is component-based.
- Advantages include high efficiency, easier JavaScript via JSX, good developer tools and SEO, and easy testing.
- Disadvantages include React only handling the view layer and requiring other libraries for full MVC functionality.
- Examples demonstrate basic components, properties, events, conditional rendering, and lists in ReactJS.
The session will provide the knowledge about react page life cycle and how more precise actions or operations can be performed using react hooks concepts
- React is a JavaScript library for building user interfaces that uses a virtual DOM for faster re-rendering on state changes.
- Everything in React is a component that can have states, props, and lifecycle methods like render(). Components return JSX elements.
- Props are used for passing data to components in a unidirectional flow, while states allow components to re-render on changes.
- The render() method returns the view, accessing props and state values. Forms and events also follow React conventions.
This document provides an introduction to React.js, including:
- React is a JavaScript library for building user interfaces and was developed by Facebook. It is the VIEW component in MVC architecture.
- Key features and benefits of React include being fast, modular, scalable, flexible, and popular due to its employability. Large companies like Facebook use React.
- Core concepts of React include JSX, components, unidirectional data flow, and the virtual DOM which improves performance compared to traditional frameworks. Components are reusable pieces that make up the entire application.
The document provides an overview of React including its introduction, prerequisites, installation, fundamentals, components, life cycle, routing, hooks, Redux, projects, testing, comparison to Angular, and tips for React developers. It discusses key React concepts such as JSX, props, state, events, DOM, and virtual DOM.
React is a JavaScript library for building user interfaces. It was created by Facebook and is best for building dynamic websites like chat applications. React uses a virtual DOM for efficiently updating the view after data changes. Components are the building blocks of React and can contain state and props. The document provides an example of a simple component class and demonstrates how to add state and props. It also includes links to example code and MicroPyramid's social media profiles.
React is an open source JavaScript library for building user interfaces. It was created by Jordan Walke at Facebook in 2011 and is now maintained by Facebook, Instagram, and a community of developers. Major companies like Facebook, Netflix, Instagram, Khan Academy, and PayPal use React to build their interfaces. React uses a virtual DOM for faster rendering and makes components that manage their own state. It uses JSX syntax and a one-way data flow that is declarative and composable.
React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It uses virtual DOM which improves performance and can render on both client and server. React encourages a component-based approach where UI is broken into independent reusable pieces that accept external data through properties. Components manage their own state which allows the UI to update over time in response to user input. This makes React code more predictable and easier to debug than traditional two-way data binding.
Http Service will help us fetch external data, post to it, etc. We need to import the http module to make use of the http service. Let us consider an example to understand how to make use of the http service.
This document provides an overview of React and Redux. It introduces React as a component-based library for building user interfaces using JavaScript and JSX. Key aspects of React include its lifecycle methods, use of a virtual DOM for fast updates, and functional stateless components. Redux is introduced as a state management library that uses a single immutable store with actions and reducers. It follows the Flux architecture pattern without a dispatcher. Hands-on demos are provided for key React and Redux concepts. Resources for further learning are also listed.
The document provides an introduction to React, a JavaScript library for building user interfaces. It discusses key React concepts like components, properties, state, one-way data flow, and JSX syntax. It also covers setting up a development environment with Create React App and shows how to create a basic React component with state. The target audience appears to be people new to React who want to learn the fundamentals.
React (or React Js) is a declarative, component-based JS library to build SPA(single page applications) which was created by Jordan Walke, a software engineer at Facebook. It is flexible and can be used in a variety of projects.
Explanation of the fundamentals of Redux with additional tips and good practices. Presented in the Munich React Native Meetup, so the sample code is using React Native. Additional code: https://github.com/nacmartin/ReduxIntro
React is a library for building user interfaces using components. It uses a virtual DOM for rendering components, which are pieces of UI defined as classes or functions. Components receive data via props and local state, and can be nested to build complex UIs. The component lifecycle includes mounting, updating, and unmounting phases. Data flows unidirectionally down the component tree. React has a vibrant ecosystem and community for continued learning.
Tutorial Videos: https://www.youtube.com/playlist?list=PLD8nQCAhR3tQ7KXnvIk_v_SLK-Fb2y_k_
Day 1 : Introduction to React, Babel and Webpack
Prerequisites of starting the workshop ( Basic understanding of Node & Express )
What is Virtual DOM?
What is React and why should we use it?
Install and set up React:
a-Using create-react-app
b-From scratch using Babel and Webpack. We will use Webpack Dev Server.
Day 2 : React Basic Concepts
Types of Components: Class-based and Functional based Components
Use of JSX
Parent, Child, and Nested Components
Difference between State and Props
Create and Handle Routes
Component Lifecycle Methods
Create a form and handling form inputs
Use of arrow functions and Spread Operator
Day 3: Advanced Concepts in React
Use of Refs
What are Higher Order Components( HOC )?
How to use HOC
Understanding Context in React
This document provides an overview of React including:
- React is a JavaScript library created by Facebook for building user interfaces
- It uses virtual DOM to efficiently re-render components on updates rather than entire page
- React supports ES6 features and uses classes, arrow functions, and other syntax
- Popular tools for React include Create React App for setting up projects and React Dev Tools for debugging
This document provides an introduction and overview of ReactJS concepts including components, JSX, props, state, lifecycle methods and the virtual DOM. It compares ReactJS to AngularJS, noting ReactJS uses a non-MVC architecture and focuses on just the view layer while AngularJS follows MVC. Later sections discuss additional ReactJS topics like Flux, Redux, Webpack and RamdaJS.
The document discusses ExpressJS, the most popular Node.js web application framework. It notes that ExpressJS is easy to get started with but may lack experience to fully understand needs. The document then covers key aspects of ExpressJS like routing, middleware, and default architecture. It proposes different schemas and approaches for cleaning out and separating concerns in ExpressJS applications, such as using entity loaders, data mappers, validators, and controlling flow through events rather than direct method calls.
On May 14, 2015, Jeff Winkler gave a talk at Harvard University's Lamont Library titled "Intro to ReactJS."
Description
Created by Facebook and Instagram, React has recently been embraced by companies and organizations including Airbnb, Khan Academy, Reddit, the BBC, and Code Academy. This presentation will be especially interesting for those using or planning to use javascript libraries such as angularJS, backbone.js, ember.js, and others.
For this talk, Jeff Winkler will present:
- An introduction to React, mixed with demos.
- An examination of how React implements Computer Science principles from Functional and Object-Oriented. The discussion will consider the impact on maintainable large-scale systems.
Biography
Jeff Winkler, is a professional developer* in the Boston area and organizer of the Boston ReactJS Meetup. In addition to the ReactJS Boston Meetup, Jeff works with React professionally at TapJoy and runs http://react.rocks.
(* Full-stack guy. ReactJS, Rails, TDD. Best OODA loop wins)
Express is a web framework for Node.js that allows routing, middleware, templating and more. It is inspired by Sinatra and uses Connect as its middleware framework. Key features include routing, middleware support, template rendering with engines like Jade, and session handling with storage options. Errors can be handled via the app.error() method. Express provides a full-featured and easy to use web development framework for Node.js.
I've been working a lot with React lately and thought it would be a good idea to share what I've learned with the group.
During this talk we'll take a look at Facebook's React library while drawing comparisons to frameworks like Angular. We'll see how we can use React and friends to create a fast and efficient single page app. Attendees are expected to have some familiarity with ES6/ES7 since we the codebase we will be looking at leverages features from the spec.
What we'll be taking a look at:
• React
• React Router
• Redux
• Redux Sagas
• Webpack
• Babel
The document discusses architecting large Node.js applications. It introduces the Cloud9 IDE and how it was used to build a JavaScript application with 10,000s of lines of code. It describes how the application was difficult to maintain due to lack of modularity. The Architect module is introduced as a way to modularize Node.js applications by treating everything as plugins that can import other plugins. Architect allows defining dependency models, easy testing of modules, and configuration of modules through options. Cloud9 uses Architect to build features like local, FTP, and SSH versions of the IDE that can run independently in a single process. Architect also enables loose coupling between modules through an event bus and centralized configuration.
React is a different way to write JavaScript apps. When it was introduced at JSConf US in May, the audience was shocked by some of its design principles. One sarcastic tweet from an audience member ended up describing React’s philosophy quite accurately: https://twitter.com/cowboy/status/339858717451362304
We’re trying to push the limits of what’s possible on the web with React. My talk will start with a brief introduction to the framework, and then dive into three controversial topics: Throwing out the notion of templates and building views with JavaScript, “re-rendering” your entire application when your data changes, and a lightweight implementation of the DOM and events.
This document provides an overview of React, including initial reactions to it, fundamental concepts like components and one-way data flow, and how the virtual DOM works. Some key points covered include:
- Initial reactions to React were mixed, with some finding it "ugly" but others seeing benefits like separation of concerns with components.
- Everything in React is a component, with data flowing in one direction from parent to child via props. State is mutable within a component.
- By using a virtual DOM, React can efficiently update the real DOM by only making necessary changes, keeping the interface fast and pure.
This document provides an overview of ExpressJS, a web application framework for Node.js. It discusses using Connect as a middleware framework to build HTTP servers, and how Express builds on Connect by adding functionality like routing, views, and content negotiation. It then covers basic Express app architecture, creating routes, using views with different template engines like Jade, passing data to views, and some advanced topics like cookies, sessions, and authentication.
This document provides an introduction and overview of ReactJS concepts including:
- Features of ReactJS like its component-based architecture and support for ES6
- What transpilers are and examples like Babel and Traceur
- Examples of setting up a basic "Hello World" React app with increasing complexity
- Additional concepts covered include properties, events, lists, conditional rendering, fetching external data and more
The document summarizes the evolution of using React within a Rails application. It describes initially using jQuery and Bootstrap for front-end development needs. It then covers adopting React to take advantage of its one-way data flow and component-based approach. Key steps included embracing ES6 syntax, adding Webpack, introducing Jest for testing, and migrating from Sprockets to manage assets. Over time, React Router and Redux were added for routing and state management. The document concludes by noting ongoing work to improve consistency.
React.js has taken the web development world by storm, and for good reason: React offers a declarative, component-oriented approach to building highly-scalable web UIs. But how can we take advantage of a JavaScript library like React in our server-side PHP applications. In this talk l cover the different ways React.js can be integrated into an existing PHP web application: from a client-side only approach to multiple techniques that support full server-side rendering with a Node.js server or PHP’s v8js. I also discuss the trade-offs in each of these designs and the challenges involved with adding React to a PHP site. Most importantly, I consider the higher-level issue of how to improve view cohesion across the client-server divide in a PHP application.
This document discusses using AngularJs and React together. It provides an overview of AngularJs and React, explaining that AngularJs is a framework for dynamic web apps while React is a library for creating user interfaces. It describes how components in React can be built to work with AngularJs and encapsulate concerns. Performance is generally better with React, especially for long lists. Ng-React is introduced as an AngularJs module that makes it easy to use React components in AngularJs applications. Examples are provided of how to render React components using Ng-React, including data bindings.
This document provides an overview and introduction to React, a JavaScript library for building user interfaces. It discusses why React is used, how to set up a React environment, core React concepts like components, props, state, lifecycles and events. It also introduces React Native for building native mobile apps with React. The document emphasizes learning React through hands-on examples and practice.
React JS is a JavaScript library for building user interfaces. It uses a virtual DOM to efficiently update the real DOM and render user interfaces from components. Components are reusable pieces of UI that accept input data via properties but maintain private state data. The lifecycle of a component involves initialization, updating due to state/prop changes, and unmounting. React uses a single-directional data flow and the concept of components makes code modular and reusable.
Universal JavaScript allows rendering the same JavaScript code on both the server and client. It involves:
1. Server-rendering the initial HTML and JavaScript for faster load times and SEO.
2. Hydrating the server-rendered app with client-side JavaScript to support interactivity.
3. Bundling both server and client code together to share components and logic between server and client rendering.
Lift provides a concise framework for developing web applications in Scala with features like convention over configuration, clean separation of presentation logic and content, and powerful AJAX and Comet support. It leverages the Scala programming language and has a responsive community. Code is more concise in Lift, increasing developer productivity.
All of us having experience with other web frameworks such as Struts,Tapestry, Rails, etc would ask “Why another framework? Does Lift really solve problems any differently or more effectively than the ones we’ve used before? The Lift Web Framework provides an advanced set of tools for quickly and easily building real-time, multi-users, interactive web applications. Lift has a unique advantage that no other web framework currently shares: the Scala programming language. Scala is a relatively new language developed by Martin Odersky and his group at EPFL Switzerland. Scala is a hybrid Object Oriented and Functional language that runs at native speeds on the JVM and fully interoperates with Java code. Lift is a hybrid web framework built on Scala. Lift derives its features and idioms from the best of existing web frameworks as well as the functional and OO features in Scala. It compiles to Java bytecode and runs on the JVM, which means that we can leverage the vast ecosystem of Java libraries just as we would with any other java web framework. This presentation details the advantages of this Scala based Web framework over all the existing frameworks that we have used uptil now and shows a small sample application built with Lift. We will create a basic application with a model that maps to RDBMS, web pages that correspond to back end logic and bind dynamically created content to elements on the webpage.
This document provides an overview and introduction to React basics including:
- Details about upcoming React lab series events on topics like routing, styles, testing, and Flux architecture
- Information on installing and using create-react-app for scaffolding React projects
- An explanation of core React concepts like components, JSX, properties, state, lifecycle methods, and the virtual DOM
- Examples of building a minimal React app with components, properties, and state
This document provides an overview of using the Backbone.js framework for client-side MVC applications. It discusses why Backbone is useful for structuring JavaScript applications, its core architecture including models, collections, views and routers. It also provides examples of how to convert jQuery code to use a Backbone-based approach and lists some real-world applications that use Backbone.
Technologies are ever changing and since we're building our applications on the shoulders of giants like Babel,... We have to stay up-to-date with the newest trends.
We at Codifly strongly believe in using the newest technologies, that's why we've organised a meetup to showcase these for you. This event was organised in collaboration with ITLab HoGent at Campus Schoonmeersen (Voskenslaan 270, 9000 Ghent).
A certain level of knowledge about these subjects is required since we're mostly be going over the recent changes. For Babel we're discussing what's new in their upcoming version 7, for Webpack the changes from 3 -> 4.6 will be discussed and for React all the new features in React 16.3 and the upcoming ones.
This document provides an overview of React including: key features like components, JSX, and unidirectional data flow; installation and technical requirements; the component lifecycle; differences from Angular; popular companies using React; and links to examples. It covers React concepts like states, props, and events. Questions from attendees are invited at the end.
This document discusses React, a JavaScript library for building user interfaces. It provides an overview of React concepts like components, props, state, lifecycle methods, and the virtual DOM. Components are the basic building blocks and can be composed to build complex UIs. Data flows unidirectionally from parent to child components via props, while state is local and mutable. The virtual DOM allows React to efficiently update the real DOM by comparing component trees.
Building complex User Interfaces with Sitecore and React
- React is a JavaScript library developed by Facebook that is used by companies like AirBnb, Netflix, and Twitter.
- React focuses only on the view layer of MVC.
- It uses a virtual DOM for rendering UI rather than directly manipulating the real DOM, allowing for faster re-renders and more efficient change detection.
React JS is a library for creating user interfaces that focuses on the view layer. It uses a virtual DOM which is a JavaScript object representation of real DOM elements to efficiently update and render components when data changes. Components can contain subcomponents in a nested structure similar to HTML. Data flows through states that store application data and react to changes, and props are used to pass data between components. The DOM represents elements in a web page as JavaScript objects that can be manipulated. React components can be functions or classes, accept arbitrary inputs via props, and return React elements describing what should appear on screen.
Avoid misery of working with legacy code
We will see how you can add independent and isolated components to existing pages; pages that may be difficult to change
React and Flux allow you to make self-contained additions that handle their own data access/persistence
This session for beginners introduces tf.data APIs for creating data pipelines by combining various "lazy operators" in tf.data, such as filter(), map(), batch(), zip(), flatmap(), take(), and so forth.
Familiarity with method chaining and TF2 is helpful (but not required). If you are comfortable with FRP, the code samples in this session will be very familiar to you.
This document provides an overview and introduction to TensorFlow 2. It discusses major changes from TensorFlow 1.x like eager execution and tf.function decorator. It covers working with tensors, arrays, datasets, and loops in TensorFlow 2. It also demonstrates common operations like arithmetic, reshaping and normalization. Finally, it briefly introduces working with Keras and neural networks in TensorFlow 2.
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, back propagation, and then a quick dive into CNNs. Basic knowledge of vectors, matrices, and derivatives is helpful in order to derive the maximum benefit from this session.
A fast-paced introduction to TensorFlow 2 about some important new features (such as generators and the @tf.function decorator) and TF 1.x functionality that's been removed from TF 2 (yes, tf.Session() has retired).
Some concise code samples are presented to illustrate how to use new features of TensorFlow 2.
A fast-paced introduction to TensorFlow 2 about some important new features (such as generators and the @tf.function decorator) and TF 1.x functionality that's been removed from TF 2 (yes, tf.Session() has retired).
Concise code samples are presented to illustrate how to use new features of TensorFlow 2. You'll also get a quick introduction to lazy operators (if you know FRP this will be super easy), along with a code comparison between TF 1.x/iterators with tf.data.Dataset and TF 2/generators with tf.data.Dataset.
Finally, we'll look at some tf.keras code samples that are based on TensorFlow 2. Although familiarity with TF 1.x is helpful, newcomers with an avid interest in learning about TensorFlow 2 can benefit from this session.
This fast-paced session provides a brief history of AI, followed by AI-related topics, such as Machine Learning, Deep Learning and Reinforcement Learning, and the most popular frameworks for Machine Learning. You will learn about some of the successes of AI, and also some of the significant challenges in AI. No specialized knowledge is required, but an avid interest is recommended to derive the maximum benefit from this session.
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, back propagation, and then a quick dive into CNNs, followed by a Keras code sample for defining a CNN. Basic knowledge of vectors, matrices, and derivatives is helpful in order to derive the maximum benefit from this session. Then we'll see a short introduction to TensorFlow 1.x and some insights into TF 2 that will be released some time this year.
Introduction to Deep Learning, Keras, and Tensorflow
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, back propagation, and then a quick dive into CNNs. Basic knowledge of vectors, matrices, and derivatives is helpful in order to derive the maximum benefit from this session. Then we'll see how to create a Convolutional Neural Network in Keras, followed by a quick introduction to TensorFlow and TensorBoard.
This session provides a brief history of AI, followed by AI-related topics, such as robots in AI, Machine Learning and Deep Learning, use cases for AI, some of the successes of AI, and also some of the significant challenges in AI. You will also learn about AI and mobile devices and the ethics of AI. An avid interest is recommended to derive the maximum benefit from this session.
This document provides an introduction to React.js, including:
- React.js uses a virtual DOM for improved performance over directly manipulating the real DOM. Components are used to build up the UI and can contain state that updates the view on change.
- The Flux architecture is described using React with unidirectional data flow from Actions to Stores to Views via a Dispatcher. This ensures state changes in a predictable way.
- Setting up React with tools like Browserify/Webpack for module bundling is discussed, along with additional topics like PropTypes, mixins, server-side rendering and React Native.
Getting started with the reactjs, basics of reactjs, introduction of reactjs, core concepts of reactjs and comparison with the other libraries/frameworks
The session will provide the knowledge about react page life cycle and how more precise actions or operations can be performed using react hooks concepts
- React is a JavaScript library for building user interfaces that uses a virtual DOM for faster re-rendering on state changes.
- Everything in React is a component that can have states, props, and lifecycle methods like render(). Components return JSX elements.
- Props are used for passing data to components in a unidirectional flow, while states allow components to re-render on changes.
- The render() method returns the view, accessing props and state values. Forms and events also follow React conventions.
This document provides an introduction to React.js, including:
- React is a JavaScript library for building user interfaces and was developed by Facebook. It is the VIEW component in MVC architecture.
- Key features and benefits of React include being fast, modular, scalable, flexible, and popular due to its employability. Large companies like Facebook use React.
- Core concepts of React include JSX, components, unidirectional data flow, and the virtual DOM which improves performance compared to traditional frameworks. Components are reusable pieces that make up the entire application.
The document provides an overview of React including its introduction, prerequisites, installation, fundamentals, components, life cycle, routing, hooks, Redux, projects, testing, comparison to Angular, and tips for React developers. It discusses key React concepts such as JSX, props, state, events, DOM, and virtual DOM.
React is a JavaScript library for building user interfaces. It was created by Facebook and is best for building dynamic websites like chat applications. React uses a virtual DOM for efficiently updating the view after data changes. Components are the building blocks of React and can contain state and props. The document provides an example of a simple component class and demonstrates how to add state and props. It also includes links to example code and MicroPyramid's social media profiles.
React is an open source JavaScript library for building user interfaces. It was created by Jordan Walke at Facebook in 2011 and is now maintained by Facebook, Instagram, and a community of developers. Major companies like Facebook, Netflix, Instagram, Khan Academy, and PayPal use React to build their interfaces. React uses a virtual DOM for faster rendering and makes components that manage their own state. It uses JSX syntax and a one-way data flow that is declarative and composable.
React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It uses virtual DOM which improves performance and can render on both client and server. React encourages a component-based approach where UI is broken into independent reusable pieces that accept external data through properties. Components manage their own state which allows the UI to update over time in response to user input. This makes React code more predictable and easier to debug than traditional two-way data binding.
Http Service will help us fetch external data, post to it, etc. We need to import the http module to make use of the http service. Let us consider an example to understand how to make use of the http service.
This document provides an overview of React and Redux. It introduces React as a component-based library for building user interfaces using JavaScript and JSX. Key aspects of React include its lifecycle methods, use of a virtual DOM for fast updates, and functional stateless components. Redux is introduced as a state management library that uses a single immutable store with actions and reducers. It follows the Flux architecture pattern without a dispatcher. Hands-on demos are provided for key React and Redux concepts. Resources for further learning are also listed.
The document provides an introduction to React, a JavaScript library for building user interfaces. It discusses key React concepts like components, properties, state, one-way data flow, and JSX syntax. It also covers setting up a development environment with Create React App and shows how to create a basic React component with state. The target audience appears to be people new to React who want to learn the fundamentals.
React (or React Js) is a declarative, component-based JS library to build SPA(single page applications) which was created by Jordan Walke, a software engineer at Facebook. It is flexible and can be used in a variety of projects.
Explanation of the fundamentals of Redux with additional tips and good practices. Presented in the Munich React Native Meetup, so the sample code is using React Native. Additional code: https://github.com/nacmartin/ReduxIntro
React is a library for building user interfaces using components. It uses a virtual DOM for rendering components, which are pieces of UI defined as classes or functions. Components receive data via props and local state, and can be nested to build complex UIs. The component lifecycle includes mounting, updating, and unmounting phases. Data flows unidirectionally down the component tree. React has a vibrant ecosystem and community for continued learning.
Tutorial Videos: https://www.youtube.com/playlist?list=PLD8nQCAhR3tQ7KXnvIk_v_SLK-Fb2y_k_
Day 1 : Introduction to React, Babel and Webpack
Prerequisites of starting the workshop ( Basic understanding of Node & Express )
What is Virtual DOM?
What is React and why should we use it?
Install and set up React:
a-Using create-react-app
b-From scratch using Babel and Webpack. We will use Webpack Dev Server.
Day 2 : React Basic Concepts
Types of Components: Class-based and Functional based Components
Use of JSX
Parent, Child, and Nested Components
Difference between State and Props
Create and Handle Routes
Component Lifecycle Methods
Create a form and handling form inputs
Use of arrow functions and Spread Operator
Day 3: Advanced Concepts in React
Use of Refs
What are Higher Order Components( HOC )?
How to use HOC
Understanding Context in React
This document provides an overview of React including:
- React is a JavaScript library created by Facebook for building user interfaces
- It uses virtual DOM to efficiently re-render components on updates rather than entire page
- React supports ES6 features and uses classes, arrow functions, and other syntax
- Popular tools for React include Create React App for setting up projects and React Dev Tools for debugging
This document provides an introduction and overview of ReactJS concepts including components, JSX, props, state, lifecycle methods and the virtual DOM. It compares ReactJS to AngularJS, noting ReactJS uses a non-MVC architecture and focuses on just the view layer while AngularJS follows MVC. Later sections discuss additional ReactJS topics like Flux, Redux, Webpack and RamdaJS.
The document discusses ExpressJS, the most popular Node.js web application framework. It notes that ExpressJS is easy to get started with but may lack experience to fully understand needs. The document then covers key aspects of ExpressJS like routing, middleware, and default architecture. It proposes different schemas and approaches for cleaning out and separating concerns in ExpressJS applications, such as using entity loaders, data mappers, validators, and controlling flow through events rather than direct method calls.
On May 14, 2015, Jeff Winkler gave a talk at Harvard University's Lamont Library titled "Intro to ReactJS."
Description
Created by Facebook and Instagram, React has recently been embraced by companies and organizations including Airbnb, Khan Academy, Reddit, the BBC, and Code Academy. This presentation will be especially interesting for those using or planning to use javascript libraries such as angularJS, backbone.js, ember.js, and others.
For this talk, Jeff Winkler will present:
- An introduction to React, mixed with demos.
- An examination of how React implements Computer Science principles from Functional and Object-Oriented. The discussion will consider the impact on maintainable large-scale systems.
Biography
Jeff Winkler, is a professional developer* in the Boston area and organizer of the Boston ReactJS Meetup. In addition to the ReactJS Boston Meetup, Jeff works with React professionally at TapJoy and runs http://react.rocks.
(* Full-stack guy. ReactJS, Rails, TDD. Best OODA loop wins)
Express is a web framework for Node.js that allows routing, middleware, templating and more. It is inspired by Sinatra and uses Connect as its middleware framework. Key features include routing, middleware support, template rendering with engines like Jade, and session handling with storage options. Errors can be handled via the app.error() method. Express provides a full-featured and easy to use web development framework for Node.js.
I've been working a lot with React lately and thought it would be a good idea to share what I've learned with the group.
During this talk we'll take a look at Facebook's React library while drawing comparisons to frameworks like Angular. We'll see how we can use React and friends to create a fast and efficient single page app. Attendees are expected to have some familiarity with ES6/ES7 since we the codebase we will be looking at leverages features from the spec.
What we'll be taking a look at:
• React
• React Router
• Redux
• Redux Sagas
• Webpack
• Babel
The document discusses architecting large Node.js applications. It introduces the Cloud9 IDE and how it was used to build a JavaScript application with 10,000s of lines of code. It describes how the application was difficult to maintain due to lack of modularity. The Architect module is introduced as a way to modularize Node.js applications by treating everything as plugins that can import other plugins. Architect allows defining dependency models, easy testing of modules, and configuration of modules through options. Cloud9 uses Architect to build features like local, FTP, and SSH versions of the IDE that can run independently in a single process. Architect also enables loose coupling between modules through an event bus and centralized configuration.
React is a different way to write JavaScript apps. When it was introduced at JSConf US in May, the audience was shocked by some of its design principles. One sarcastic tweet from an audience member ended up describing React’s philosophy quite accurately: https://twitter.com/cowboy/status/339858717451362304
We’re trying to push the limits of what’s possible on the web with React. My talk will start with a brief introduction to the framework, and then dive into three controversial topics: Throwing out the notion of templates and building views with JavaScript, “re-rendering” your entire application when your data changes, and a lightweight implementation of the DOM and events.
This document provides an overview of React, including initial reactions to it, fundamental concepts like components and one-way data flow, and how the virtual DOM works. Some key points covered include:
- Initial reactions to React were mixed, with some finding it "ugly" but others seeing benefits like separation of concerns with components.
- Everything in React is a component, with data flowing in one direction from parent to child via props. State is mutable within a component.
- By using a virtual DOM, React can efficiently update the real DOM by only making necessary changes, keeping the interface fast and pure.
This document provides an overview of ExpressJS, a web application framework for Node.js. It discusses using Connect as a middleware framework to build HTTP servers, and how Express builds on Connect by adding functionality like routing, views, and content negotiation. It then covers basic Express app architecture, creating routes, using views with different template engines like Jade, passing data to views, and some advanced topics like cookies, sessions, and authentication.
This document provides an introduction and overview of ReactJS concepts including:
- Features of ReactJS like its component-based architecture and support for ES6
- What transpilers are and examples like Babel and Traceur
- Examples of setting up a basic "Hello World" React app with increasing complexity
- Additional concepts covered include properties, events, lists, conditional rendering, fetching external data and more
React on Rails - RailsConf 2017 (Phoenix)Jo Cranford
The document summarizes the evolution of using React within a Rails application. It describes initially using jQuery and Bootstrap for front-end development needs. It then covers adopting React to take advantage of its one-way data flow and component-based approach. Key steps included embracing ES6 syntax, adding Webpack, introducing Jest for testing, and migrating from Sprockets to manage assets. Over time, React Router and Redux were added for routing and state management. The document concludes by noting ongoing work to improve consistency.
Integrating React.js Into a PHP ApplicationAndrew Rota
React.js has taken the web development world by storm, and for good reason: React offers a declarative, component-oriented approach to building highly-scalable web UIs. But how can we take advantage of a JavaScript library like React in our server-side PHP applications. In this talk l cover the different ways React.js can be integrated into an existing PHP web application: from a client-side only approach to multiple techniques that support full server-side rendering with a Node.js server or PHP’s v8js. I also discuss the trade-offs in each of these designs and the challenges involved with adding React to a PHP site. Most importantly, I consider the higher-level issue of how to improve view cohesion across the client-server divide in a PHP application.
This document discusses using AngularJs and React together. It provides an overview of AngularJs and React, explaining that AngularJs is a framework for dynamic web apps while React is a library for creating user interfaces. It describes how components in React can be built to work with AngularJs and encapsulate concerns. Performance is generally better with React, especially for long lists. Ng-React is introduced as an AngularJs module that makes it easy to use React components in AngularJs applications. Examples are provided of how to render React components using Ng-React, including data bindings.
This document provides an overview and introduction to React, a JavaScript library for building user interfaces. It discusses why React is used, how to set up a React environment, core React concepts like components, props, state, lifecycles and events. It also introduces React Native for building native mobile apps with React. The document emphasizes learning React through hands-on examples and practice.
React JS is a JavaScript library for building user interfaces. It uses a virtual DOM to efficiently update the real DOM and render user interfaces from components. Components are reusable pieces of UI that accept input data via properties but maintain private state data. The lifecycle of a component involves initialization, updating due to state/prop changes, and unmounting. React uses a single-directional data flow and the concept of components makes code modular and reusable.
Universal JavaScript allows rendering the same JavaScript code on both the server and client. It involves:
1. Server-rendering the initial HTML and JavaScript for faster load times and SEO.
2. Hydrating the server-rendered app with client-side JavaScript to support interactivity.
3. Bundling both server and client code together to share components and logic between server and client rendering.
Lift provides a concise framework for developing web applications in Scala with features like convention over configuration, clean separation of presentation logic and content, and powerful AJAX and Comet support. It leverages the Scala programming language and has a responsive community. Code is more concise in Lift, increasing developer productivity.
Overview of The Scala Based Lift Web FrameworkIndicThreads
All of us having experience with other web frameworks such as Struts,Tapestry, Rails, etc would ask “Why another framework? Does Lift really solve problems any differently or more effectively than the ones we’ve used before? The Lift Web Framework provides an advanced set of tools for quickly and easily building real-time, multi-users, interactive web applications. Lift has a unique advantage that no other web framework currently shares: the Scala programming language. Scala is a relatively new language developed by Martin Odersky and his group at EPFL Switzerland. Scala is a hybrid Object Oriented and Functional language that runs at native speeds on the JVM and fully interoperates with Java code. Lift is a hybrid web framework built on Scala. Lift derives its features and idioms from the best of existing web frameworks as well as the functional and OO features in Scala. It compiles to Java bytecode and runs on the JVM, which means that we can leverage the vast ecosystem of Java libraries just as we would with any other java web framework. This presentation details the advantages of this Scala based Web framework over all the existing frameworks that we have used uptil now and shows a small sample application built with Lift. We will create a basic application with a model that maps to RDBMS, web pages that correspond to back end logic and bind dynamically created content to elements on the webpage.
This document provides an overview and introduction to React basics including:
- Details about upcoming React lab series events on topics like routing, styles, testing, and Flux architecture
- Information on installing and using create-react-app for scaffolding React projects
- An explanation of core React concepts like components, JSX, properties, state, lifecycle methods, and the virtual DOM
- Examples of building a minimal React app with components, properties, and state
This document provides an overview of using the Backbone.js framework for client-side MVC applications. It discusses why Backbone is useful for structuring JavaScript applications, its core architecture including models, collections, views and routers. It also provides examples of how to convert jQuery code to use a Backbone-based approach and lists some real-world applications that use Backbone.
Technologies are ever changing and since we're building our applications on the shoulders of giants like Babel,... We have to stay up-to-date with the newest trends.
We at Codifly strongly believe in using the newest technologies, that's why we've organised a meetup to showcase these for you. This event was organised in collaboration with ITLab HoGent at Campus Schoonmeersen (Voskenslaan 270, 9000 Ghent).
A certain level of knowledge about these subjects is required since we're mostly be going over the recent changes. For Babel we're discussing what's new in their upcoming version 7, for Webpack the changes from 3 -> 4.6 will be discussed and for React all the new features in React 16.3 and the upcoming ones.
This document provides an overview of React including: key features like components, JSX, and unidirectional data flow; installation and technical requirements; the component lifecycle; differences from Angular; popular companies using React; and links to examples. It covers React concepts like states, props, and events. Questions from attendees are invited at the end.
This document discusses React, a JavaScript library for building user interfaces. It provides an overview of React concepts like components, props, state, lifecycle methods, and the virtual DOM. Components are the basic building blocks and can be composed to build complex UIs. Data flows unidirectionally from parent to child components via props, while state is local and mutable. The virtual DOM allows React to efficiently update the real DOM by comparing component trees.
Building complex User Interfaces with Sitecore and ReactJonne Kats
- React is a JavaScript library developed by Facebook that is used by companies like AirBnb, Netflix, and Twitter.
- React focuses only on the view layer of MVC.
- It uses a virtual DOM for rendering UI rather than directly manipulating the real DOM, allowing for faster re-renders and more efficient change detection.
React JS is a library for creating user interfaces that focuses on the view layer. It uses a virtual DOM which is a JavaScript object representation of real DOM elements to efficiently update and render components when data changes. Components can contain subcomponents in a nested structure similar to HTML. Data flows through states that store application data and react to changes, and props are used to pass data between components. The DOM represents elements in a web page as JavaScript objects that can be manipulated. React components can be functions or classes, accept arbitrary inputs via props, and return React elements describing what should appear on screen.
Adding a modern twist to legacy web applicationsJeff Durta
Avoid misery of working with legacy code
We will see how you can add independent and isolated components to existing pages; pages that may be difficult to change
React and Flux allow you to make self-contained additions that handle their own data access/persistence
This session for beginners introduces tf.data APIs for creating data pipelines by combining various "lazy operators" in tf.data, such as filter(), map(), batch(), zip(), flatmap(), take(), and so forth.
Familiarity with method chaining and TF2 is helpful (but not required). If you are comfortable with FRP, the code samples in this session will be very familiar to you.
This document provides an overview and introduction to TensorFlow 2. It discusses major changes from TensorFlow 1.x like eager execution and tf.function decorator. It covers working with tensors, arrays, datasets, and loops in TensorFlow 2. It also demonstrates common operations like arithmetic, reshaping and normalization. Finally, it briefly introduces working with Keras and neural networks in TensorFlow 2.
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, back propagation, and then a quick dive into CNNs. Basic knowledge of vectors, matrices, and derivatives is helpful in order to derive the maximum benefit from this session.
A fast-paced introduction to TensorFlow 2 about some important new features (such as generators and the @tf.function decorator) and TF 1.x functionality that's been removed from TF 2 (yes, tf.Session() has retired).
Some concise code samples are presented to illustrate how to use new features of TensorFlow 2.
A fast-paced introduction to TensorFlow 2 about some important new features (such as generators and the @tf.function decorator) and TF 1.x functionality that's been removed from TF 2 (yes, tf.Session() has retired).
Concise code samples are presented to illustrate how to use new features of TensorFlow 2. You'll also get a quick introduction to lazy operators (if you know FRP this will be super easy), along with a code comparison between TF 1.x/iterators with tf.data.Dataset and TF 2/generators with tf.data.Dataset.
Finally, we'll look at some tf.keras code samples that are based on TensorFlow 2. Although familiarity with TF 1.x is helpful, newcomers with an avid interest in learning about TensorFlow 2 can benefit from this session.
This fast-paced session provides a brief history of AI, followed by AI-related topics, such as Machine Learning, Deep Learning and Reinforcement Learning, and the most popular frameworks for Machine Learning. You will learn about some of the successes of AI, and also some of the significant challenges in AI. No specialized knowledge is required, but an avid interest is recommended to derive the maximum benefit from this session.
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, back propagation, and then a quick dive into CNNs, followed by a Keras code sample for defining a CNN. Basic knowledge of vectors, matrices, and derivatives is helpful in order to derive the maximum benefit from this session. Then we'll see a short introduction to TensorFlow 1.x and some insights into TF 2 that will be released some time this year.
Introduction to Deep Learning, Keras, and TensorflowOswald Campesato
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, back propagation, and then a quick dive into CNNs. Basic knowledge of vectors, matrices, and derivatives is helpful in order to derive the maximum benefit from this session. Then we'll see how to create a Convolutional Neural Network in Keras, followed by a quick introduction to TensorFlow and TensorBoard.
Introduction to Deep Learning for Non-ProgrammersOswald Campesato
This session provides a brief history of AI, followed by AI-related topics, such as robots in AI, Machine Learning and Deep Learning, use cases for AI, some of the successes of AI, and also some of the significant challenges in AI. You will also learn about AI and mobile devices and the ethics of AI. An avid interest is recommended to derive the maximum benefit from this session.
An introductory presentation covered key concepts in deep learning including neural networks, activation functions, cost functions, and optimization methods. Popular deep learning frameworks TensorFlow and tensorflow.js were discussed. Common deep learning architectures like convolutional neural networks and generative adversarial networks were explained. Examples and code snippets in Python demonstrated fundamental deep learning concepts.
An introductory document covered deep learning concepts including neural networks, activation functions, cost functions, gradient descent, TensorFlow, CNNs, RNNs, GANs, and tensorflow.js. Key topics included the use of deep learning for computer vision, speech recognition, and more. Activation functions such as ReLU, sigmoid and tanh were explained. TensorFlow and tensorflow.js were introduced as frameworks for deep learning.
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, back propagation, and then a quick dive into CNNs. Basic knowledge of vectors, matrices, and derivatives is helpful in order to derive the maximum benefit from this session. Then we'll see a short introduction to TensorFlow and TensorBoard.
A fast-paced introduction to Deep Learning (DL) concepts, starting with a simple yet complete neural network (no frameworks), followed by aspects of deep neural networks, such as back propagation, activation functions, CNNs, and the AUT theorem. Next, a quick introduction to TensorFlow and TensorBoard, along with some code samples with TensorFlow. For best results, familiarity with basic vectors and matrices, inner (aka "dot") products of vectors, the notion of a derivative, and rudimentary Python is recommended.
Intro to Deep Learning, TensorFlow, and tensorflow.jsOswald Campesato
This fast-paced session introduces Deep Learning concepts, such gradient descent, back propagation, activation functions, and CNNs. We'll look at creating Android apps with TensorFlow Lite (pending its availability). Basic knowledge of vectors, matrices, and Android, as well as elementary calculus (derivatives), are strongly recommended in order to derive the maximum benefit from this session.
This document provides an overview and introduction to deep learning. It discusses key concepts such as neural networks, hidden layers, activation functions, cost functions, and gradient descent. Specific deep learning applications are highlighted, including computer vision, speech recognition, and recommendation systems. Deep learning frameworks like TensorFlow and concepts like convolutional neural networks (CNNs) and generative adversarial networks (GANs) are also explained at a high level. The document aims to introduce attendees to the main ideas and terminology within deep learning.
A fast-paced introduction to Deep Learning concepts, such as activation functions, cost functions, backpropagation, and then a quick dive into CNNs. Basic knowledge of vectors, matrices, and elementary calculus (derivatives), are helpful in order to derive the maximum benefit from this session.
Next we'll see a simple neural network using Keras, followed by an introduction to TensorFlow and TensorBoard. (Bonus points if you know Zorn's Lemma, the Well-Ordering Theorem, and the Axiom of Choice.)
This fast-paced session starts with an introduction to neural networks and linear regression models, along with a quick view of TensorFlow, followed by some Scala APIs for TensorFlow. You'll also see a simple dockerized image of Scala and TensorFlow code and how to execute the code in that image from the command line. No prior knowledge of NNs, Keras, or TensorFlow is required (but you must be comfortable with Scala).
"A fast-paced introduction to Deep Learning (DL) concepts, such as neural networks, back propagation, activation functions, and CNNs. We'll also look at JavaScript-based toolkits (such as TensorFire and deeplearning.js) that leverage the power of WebGL. Basic knowledge of elementary calculus (e.g., derivatives) is recommended in order to derive the maximum benefit from this session.
A fast-paced introduction to Deep Learning that starts with a simple yet complete neural network (no frameworks), followed by an overview of activation functions, cost functions, backpropagation, and then a quick dive into CNNs. Next we'll create a neural network using Keras, followed by an introduction to TensorFlow and TensorBoard. For best results, familiarity with basic vectors and matrices, inner (aka "dot") products of vectors, and rudimentary Python is definitely helpful.
This document provides an overview and introduction to deep learning concepts including linear regression, activation functions, gradient descent, backpropagation, hyperparameters, convolutional neural networks (CNNs), recurrent neural networks (RNNs), and TensorFlow. It discusses clustering examples to illustrate neural networks, explores different activation functions and cost functions, and provides code examples of TensorFlow operations, constants, placeholders, and saving graphs.
Seamless PostgreSQL to Snowflake Data Transfer in 8 Simple StepsEstuary Flow
Unlock the full potential of your data by effortlessly migrating from PostgreSQL to Snowflake, the leading cloud data warehouse. This comprehensive guide presents an easy-to-follow 8-step process using Estuary Flow, an open-source data operations platform designed to simplify data pipelines.
Discover how to seamlessly transfer your PostgreSQL data to Snowflake, leveraging Estuary Flow's intuitive interface and powerful real-time replication capabilities. Harness the power of both platforms to create a robust data ecosystem that drives business intelligence, analytics, and data-driven decision-making.
Key Takeaways:
1. Effortless Migration: Learn how to migrate your PostgreSQL data to Snowflake in 8 simple steps, even with limited technical expertise.
2. Real-Time Insights: Achieve near-instantaneous data syncing for up-to-the-minute analytics and reporting.
3. Cost-Effective Solution: Lower your total cost of ownership (TCO) with Estuary Flow's efficient and scalable architecture.
4. Seamless Integration: Combine the strengths of PostgreSQL's transactional power with Snowflake's cloud-native scalability and data warehousing features.
Don't miss out on this opportunity to unlock the full potential of your data. Read & Download this comprehensive guide now and embark on a seamless data journey from PostgreSQL to Snowflake with Estuary Flow!
Try it Free: https://dashboard.estuary.dev/register
Lots of bloggers are using Google AdSense now. It’s getting really popular. With AdSense, bloggers can make money by showing ads on their websites. Read this important article written by the experienced designers of the best website designing company in Delhi –
An MVP (Minimum Viable Product) mobile application is a streamlined version of a mobile app that includes only the core features necessary to address the primary needs of its users. The purpose of an MVP is to validate the app concept with minimal resources, gather user feedback, and identify any areas for improvement before investing in a full-scale development. This approach allows businesses to quickly launch their app, test its market viability, and make data-driven decisions for future enhancements, ensuring a higher likelihood of success and user satisfaction.
Are you wondering how to migrate to the Cloud? At the ITB session, we addressed the challenge of managing multiple ColdFusion licenses and AWS EC2 instances. Discover how you can consolidate with just one EC2 instance capable of running over 50 apps using CommandBox ColdFusion. This solution supports both ColdFusion flavors and includes cb-websites, a GoLang binary for managing CommandBox websites.
COMPSAC 2024 D&I Panel: Charting a Course for Equity: Strategies for Overcomi...Hironori Washizaki
Hironori Washizaki, "Charting a Course for Equity: Strategies for Overcoming Challenges and Promoting Inclusion in the Metaverse", IEEE COMPSAC 2024 D&I Panel, 2024.
Explore the rapid development journey of TryBoxLang, completed in just 48 hours. This session delves into the innovative process behind creating TryBoxLang, a platform designed to showcase the capabilities of BoxLang by Ortus Solutions. Discover the challenges, strategies, and outcomes of this accelerated development effort, highlighting how TryBoxLang provides a practical introduction to BoxLang's features and benefits.
What is OCR Technology and How to Extract Text from Any Image for FreeTwisterTools
Discover the fascinating world of Optical Character Recognition (OCR) technology with our comprehensive presentation. Learn how OCR converts various types of documents, such as scanned paper documents, PDFs, or images captured by a digital camera, into editable and searchable data. Dive into the history, modern applications, and future trends of OCR technology. Get step-by-step instructions on how to extract text from any image online for free using a simple tool, along with best practices for OCR image preparation. Ideal for professionals, students, and tech enthusiasts looking to harness the power of OCR.
Overview of ERP - Mechlin Technologies.pptxMitchell Marsh
This PowerPoint presentation provides a comprehensive overview of Enterprise Resource Planning (ERP) systems. It covers the fundamental concepts, benefits, and key functionalities of ERP software, illustrating how it integrates various business processes into a unified system. From finance and HR to supply chain and customer relationship management, ERP facilitates efficient data management and decision-making across organizations. Whether you're new to ERP or looking to deepen your understanding, this presentation offers valuable insights into leveraging ERP for business success.
A captivating AI chatbot PowerPoint presentation is made with a striking backdrop in order to attract a wider audience. Select this template featuring several AI chatbot visuals to boost audience engagement and spontaneity. With the aid of this multi-colored template, you may make a compelling presentation and get extra bonuses. To easily elucidate your ideas, choose a typeface with vibrant colors. You can include your data regarding utilizing the chatbot methodology to the remaining half of the template.
introduction of Ansys software and basic and advance knowledge of modelling s...sachin chaurasia
Ansys Mechanical enables you to solve complex structural engineering problems and make better, faster design decisions. With the finite element analysis (FEA) solvers available in the suite, you can customize and automate solutions for your structural mechanics problems and parameterize them to analyze multiple design scenarios. Ansys Mechanical is a dynamic tool that has a complete range of analysis tools.
In this talk, we will explore strategies to optimize the success rate of storing and retaining new information. We will discuss scientifically proven ideal learning intervals and content structures. Additionally, we will examine how to create an environment that improves our focus while you remain in the “flow”. Lastly we will also address the influence of AI on learning capabilities.
In the dynamic field of software development, this knowledge will empower you to accelerate your learning curve and support others in their learning journeys.
Cultural Shifts: Embracing DevOps for Organizational TransformationMindfire Solution
Mindfire Solutions specializes in DevOps services, facilitating digital transformation through streamlined software development and operational efficiency. Their expertise enhances collaboration, accelerates delivery cycles, and ensures scalability using cloud-native technologies. Mindfire Solutions empowers businesses to innovate rapidly and maintain competitive advantage in dynamic market landscapes.
2. What is ReactJS?
• Library for Web Apps (from Facebook)
• Provides the “V” in “MVC”
• component-based architecture
• ES6/JSX (HTML embedded in JavaScript)
• 400 components available:
https://github.com/brillout/awesome-react-components
3. Advantages of ReactJS
• highly efficient
• easier to write Javascript via JSX
• out-of-the-box developer tools
• very good for SEO
• easy to write UI test cases
• http://www.pro-tekconsulting.com/blog/advantages-
disadvantages-of-react-js/
4. Disadvantages of ReactJS
• ReactJS is only a view layer
• ReactJS into an MVC framework requires configuration
• learning curve for beginners who are new to web
development
• Scaffolding is usually needed for transpilation
5. What are Transpilers?
• They convert code from one language to another
• Babel (formerly 6to5):
+converts ES6 (some ES7) to ECMA5
+ appears to be the de facto standard
• Traceur (Google):
+ converts ES6 to ECMA5
+ used by Angular 2
NOTE: JSX is transpiled by ECMA5
6. Typical Set-up Tools
• Node and npm (installing JS dependencies)
• Babel (in HTML Web pages)
• Webpack (highly recommended)
• NB: you can use Gulp instead of WebPack
• https://www.eventbrite.com/e/react-js-foundation-
hands-on-workshop-tickets-27743432353
7. React App (MyWebPage.html)
<!– The core React library -->
<script src="https://fb.me/react-15.0.0-rc.2.js"></script>
<!– The ReactDOM Library -->
<script src="https://fb.me/react-dom-15.0.0-rc.2.js">
</script>
<!– For transpiling ES6 code into ES5 code -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-
core/5.8.23/browser.min.js">
</script>
10. The render() Method in ReactJS
• Contains one top-level “root” element
• a <div> is often the top-level element
• render() is invoked when a state change occurs
• NB: a <View> is the top-level element in React Native
11. Using “Props” in ReactJS
<div id="hello"></div>
• <script type="text/babel">
• var Hello = React.createClass({ // deprecated in 0.14.3
• render: function () {
• var name = this.props.name;
•
• return ( <h2>Hello {name}</h2> );
• }
• });
• ReactDOM.render(<Hello name="Dave"/>,
• document.getElementById('hello'));
• </script>
12. Property Types in ReactJS
propTypes contains properties and their types:
propTypes: {
width: React.PropTypes.number,
height: React.PropTypes.number
//other1: React.PropTypes.string,
//other2: React.PropTypes.array.isRequired,
},
13. Property Types and Validation
How to throw an error if any property is negative:
propTypes: {
width: function(props, propName, componentName) {
if(props[propName] < 0) {
throw new Error(propName+" cannot be negative");
}
}
},
14. The “getDefaultProps()” Method
<div id="container"></div>
<script type="text/babel">
var Hello = React.createClass({
getDefaultProps: function () {
return { y : 456 }
},
render: function () {
return (
<h2>x = {this.props.x} y = {this.props.y} </h2>
);
}
});
ReactDOM.render(<Hello x={123}/>,
document.getElementById('container'));
</script>
16. SVG in ReactJS (part 1)
<div id="mysvg"></div>
<script type="text/babel">
class MySVG extends React.Component {
constructor () {
super();
}
// more code in the next slide…
23. Working with Lists (2b)
class ListOptions extends React.Component {
render() {
return (
<li>{this.props.value}</li>
)
}
}
ReactDOM.render( <UserList/>,
document.getElementById('container')
)
24. Sometimes we Need JavaScript Functions
• Use map() to apply a function to an array of items:
a) Returns a new array with ‘transformed’ elements
b) You specify the function
• Use filter() to return a subarray of items:
involves conditional logic (defined by you)
• Other functions: merge(), flatten(), reduce(), …
• NB: you can combine them via method chaining
25. The ‘map’ and ‘filter’ Functions
var items = [1,2,3,4,5,6,7,8,9,10,11,
12,13,14,15,16,17,18,19,20];
var even = [], double = [];
even = items.filter(function(item) {
return item % 2 == 0;
});
console.log("even = "+even);
double = items.map(function(item) {
return item * 2;
});
console.log("double = "+double);
31. ReactJS: Lifecycle methods
Consider the following scenario:
A Web page contains GSAP code to animate SVG elements
The SVG elements are dynamically generated
There is no static SVG content
Q: where do you place the GSAP code?
A: in the componentDidMount() method
32. Working with State (1a)
class MyInput extends React.Component {
constructor() {
super();
}
componentWillMount() {
this.state = {value: 'Hello There!'};
}
handleChange(event) {
this.setState({value: event.target.value});
console.log("value: "+this.state.value);
}
33. Working with State (1b)
render() {
var value = this.state.value;
return <input type="text" value={value}
onChange={this.handleChange} />;
}
}
ReactDOM.render(
<MyInput />,
document.getElementById('myinput')
);
34. Update List of Users (1)
class UserList extends React.Component {
constructor() {
super();
this.userList = ['Sara', 'Dave', 'John', 'Sally’ ];
this.addUser = this.addUser.bind(this);
}
componentDidMount() {
this.setState({user: ""});
}
addUser() {
var user = this.refs.user.value;
//console.log("user = "+user);
this.setState({user: user});
this.userList.push(user);
}
40. Retrieving Github User Data (2)
render() {
if (this.state.loading) { return <span>Loading...</span>; }
else if (this.state.error !== null) {
return <span>Error: {this.state.error.message}</span>;
}
else {
var userInfo = this.state.data;
return (
<ul>
<li>Username: {userInfo.login} </li>
<li>Followers: {userInfo.followers} </li>
<li>Following: {userInfo.following} </li>
<li>Created at: {userInfo.created_at}</li>
</ul>
)
}}}
41. Retrieving Github User Data (3)
ReactDOM.render(
<UserInfo
promise={$.getJSON('https://api.github.com/users/ocampesato')} />,
document.getElementById("userinfo")
);
42. What about React Routing?
• Routing: how to access different parts of an app
• Static routing and Dynamic routing
• http://rwhitmire.com/react-routify
• ReactRouter v4 contains major changes:
https://github.com/ReactTraining/react-
router/blob/v4/README.md#v4-faq
43. Heroku and create-react-app (1)
https://github.com/facebookincubator/
a FB endorsed and supported way to build real React apps
Zero configuration deployment to Heroku:
https://blog.heroku.com/deploying-react-with-zero-
configuration
https://github.com/mars/create-react-app-buildpack#usage
45. Higher Order Components
• Define functions that take a component as an argument
and then return a component
• https://medium.com/javascript-inside/why-the-hipsters-
recompose-everything-23ac08748198#.ojvtuun57
• Now let’s take a detour to ES6….
46. What about ES6?
• Arrow functions and let keyword
• Block scopes
• Classes and inheritance
• Default parameters
• Destructured assignment
• Generators, Iterators, Maps, and Sets
• Promises and Rest parameters
• Spread operator
• Template Literals
47. ES6 let and Arrow Functions
• let square = x => x * x;
• let add = (x, y) => x + y;
• let pi = () => 3.1415;
• console.log(square(8)); // 64
• console.log(add(5, 9)); // 14
• console.log(pi()); // 3.1415
48. ES6 Class Definition (part 1)
class Rectangle {
constructor(height, width) {
this.height = height;
this.width = width;
}
calcArea() {
return this.height * this.width;
}
}
• var r1 = new Rectangle(5,10);
• var r2 = new Rectangle(25,15);
49. ES6 Class Definition (part 2)
• console.log("r1 area = "+r1.calcArea());
• console.log("r2 area = "+r2.calcArea());
• Test this code here: http://babeljs.io/repl/
• More Examples:
https://developer.mozilla.org/en-
US/docs/Web/JavaScript/Reference/Classes
50. Browser Status for ES6
• Modern IE: https://goo.gl/56n7IL
• Mozilla: https://goo.gl/iSNDf9
• Chrome: https://www.chromestatus.com/features#ES6
51. Other Useful ES6 Links
https://github.com/lukehoban/es6features
http://kangax.github.io/compat-table/es6/
https://dev.modern.ie/platform/status/?filter=f3f0000bf&search=es6
https://developer.mozilla.org/en-
US/docs/Web/JavaScript/New_in_JavaScript/ECMAScript_6_support_i
n_Mozilla
https://medium.com/@bojzi/overview-of-the-javascript-ecosystem-
8ec4a0b7a7be
Next we’ll discuss application state….
52. Application State can be Complicated
• Suppose a ReactJS has many components
• What if state is required in multiple components?
• Where is state maintained?
• resembles a C++ class hierarchy a “thick” base class allows for
easy access, but some things don’t belong in the base class
• One solution: store state outside the app (Redux)
53. ReactJS + Flux (Facebook)
• Flux is a pattern (Facebook)
• unidirectional data flow
• Many implementations of Flux are available
• Redux is an implementation of Flux . . .
54. ReactJS + Redux (Facebook)
• Redux is an implementation of Flux
• the most popular implementation (at least 15 others)
• Mobx (simpler alternative) and Alt
• “advanced state management”
• Actions, Dispatcher, reducer, and Store(s)
• Reductor: Redux for Android
55. ReactJS + Redux (Facebook)
• How Redux works:
• Create a Redux store
• Dispatcher passes Action and Store to Reducer
• Reducer updates the Store
• View is notified and updated accordingly
56. Redux versus Mobx
• Redux: influenced by functional programming
• Mobx: influenced by OOP and Reactive Programming
• More detailed comparison of Redux and Mobx:
1) http://www.robinwieruch.de/redux-mobx-confusion
2)https://medium.com/@sanketsahu/if-not-redux-then-
what-fc433234f5b4#.38tus3hai
3) http://blog.bandwidth.com/using-react-js-for-front-end-
development
57. ReactJS + GraphQL (Facebook)
• GraphQL: a server-side schema for graph-oriented data
• Can “wrap” NoSQL and relational stores
• GraphQL server processes data requests from clients
• Data is returned to client apps
• http://githubengineering.com/the-github-graphql-api/
• NB: GraphQL does not need Relay (but Relay needs GraphQL)
58. GraphQL versus REST
• GraphQL is a “finer-grained” alternative to REST
• REST is all-or-nothing: an “entity” is returned
• GraphQL returns a subset of elements of an “entity”
• Falcor from Netflix: GraphQL alternative (without a schema)
59. GraphQL: What it isn’t
• GQL does not dictate a server language
• GQL does not dictate a storage/back-end
• GQL is a query language without a database
60. GraphQL: What Does it Do?
• It exposes a single endpoint
• the endpoint parses and executes a query
• The query executes over a type system
• the type system is defined in the application server
• the type system is available via introspection (a GQL API)
61. GraphQL Server Structure
GraphQL servers have three components:
• 1) GraphQL “core” (JavaScript and other languages)
• 2) Type Definitions (maps app code to internal system)
• 3) Application code (business logic)
62. GraphQL Core: Five Components
• 1) Frontend lexer/parser: an AST [Relay uses parser]
• 2) Type System: GraphQLObjectType (a class)
• 3) Introspection: for querying types
• 4) Validation: is a query valid in the app’s schema?
• 5) Execution: manage query execution (via the AST)
63. The GraphiQL IDE
• https://github.com/skevy/graphiql-
app/blob/master/README.md
• https://github.com/skevy/graphiql-app/releases
• OSX: brew cask install graphiql
66. GraphQL Queries
• query EmpNameQuery {
• emp {
• fname
• lname
• }
• }
• The result of the preceding query is here:
• {
• "data": [{
• "emp": {
• "fname": "John",
• "lname": "Smith"
• }
• }]
• }
67. GraphQL Websites
• Apollo: http://www.apollostack.com/
“consolidates” data (removes duplicates in a tree)
• Reindex: https://www.reindex.io/blog/redux-and-
relay
• Scaphold: scaphold.io
• Upcoming SF conference: http://graphqlsummit.com/
68. GraphQL Websites
• Apollo: http://www.apollostack.com/
“consolidates” data (removes duplicates in a tree)
• Reindex: https://www.reindex.io/blog/redux-and-relay
• Scaphold: https://scaphold.io/#/
• GraphiQL: https://github.com/skevy/graphiql-app
• GraphQL conference: http://graphqlsummit.com/
69. ReactJS + Relay (Facebook)
• Relay: a “wrapper” around client-side components
• Data requests from a component “go through” Relay
• Relay sends data requests to a GraphQL server
• Data is returned to client application
• Data is displayed according to application code/logic
71. What is React Native? (Facebook)
• Facebook toolkit for cross-platform native mobile apps
• https://facebook.github.io/react-native/
• You write custom JSX code for Android and iOS
• Update contents of index.android.js and index.ios.js
• Invoke react-native from command line
• Update cycle: Mobile app is updated via “hot reloading”
72. React Native Components
• https://github.com/react-native-community/react-native-elements
• Buttons
• Icons
• Social Icons / Buttons
• Side Menu
• Form Elements
• Search Bar
• ButtonGroup
• Checkboxes
• List Element
• Linked List Element
• Cross Platform Tab Bar
• HTML style headings (h1, h2, etc...)
• Card component
• Pricing Component
73. React Native Installation
• iOS apps: make sure you’ve installed Xcode
• Android apps: install Java/Android/NDK:
set JAVA_HOME, ANDROID_HOME, and NDK_HOME
• Now install react-native:
[sudo] npm install –g react-native
• Create an application:
react-native new FirstApp
Start an application: react-native run-android
74. More Stuff About React Native
• Top-level element in render() must be a <View> element
• You can create custom native components (Android&iOS)
• Supports Flux/Redux/Relay/GraphQL
• React Native with Redux:
https://github.com/ReactConvention/react-native-redux-
starter-kit
75. React Native IDEs/Toolkits
IDES: Deco (open source) and XDE (from Exponent)
Very good “Starter kits” (with lots of components):
ignite: https://infinite.red/ignite
nativebase: https://github.com/GeekyAnts/NativeBase
react-native ble: https://github.com/Polidea/react-native-
ble-plx
react-native-bg-geo:
https://github.com/transistorsoft/react-native-background-
geolocation
77. Some Useful Tools/IDEs
• Select an IDE:
+WebStorm 10: free 30-day trial ($49/year)
+Visual Studio Code (free)
+ Atom (free) with atom-TypeScript extension
• Command Line Tools:
+ npm, npmjs, gulp, grunt (older), broccoli,
+ webpack, browserify (older), jspm+systemjs
https://github.com/addyosmani/es6-tools
78. Useful Technologies to Learn
• Main features of ES6 (and methods in ECMA5)
• Sass/Bootstrap 4 (previously: less)
• https://react-bootstrap.github.io/
• D3.js for Data Visualization
• React Native (=ReactJS for Native Mobile)
• https://egghead.io/react-redux-cheatsheets
79. Recent/Upcoming Books and Training
1) HTML5 Canvas and CSS3 Graphics (2013)
2) jQuery, CSS3, and HTML5 for Mobile (2013)
3) HTML5 Pocket Primer (2013)
4) jQuery Pocket Primer (2013)
5) HTML5 Mobile Pocket Primer (2014)
6) D3 Pocket Primer (2015)
7) Python Pocket Primer (2015)
8) SVG Pocket Primer (2016)
9) CSS3 Pocket Primer (2016)
10) Angular 2 Pocket Primer (2017)