Great design patterns are reusable, modular expressions of what’s going on in your code. They allow you to communicate to other developers simply by the way you code, in addition to being easily maintainable themselves. Put simply, patterns are the available tools in the developer’s toolbox.
In this presentation, I review a few common patterns, their advantages/disadvantages, and how they can be implemented.
The source for this presentation can be found here: https://github.com/derekbrown/designpatterns
Slides from Ajax Experience 2009. In this session:
- Object creation patterns
- Code reuse patterns
- Functional patterns
- More on object creation
- Design patterns
Some example patterns: object creation with literals and constructos, prototypes, inheritance and other code reuse patterns, lazy definition, callbacks, singleton, factory, classical and prototypal inheritance, namespaces, chaining, modules, static methods, private and privileged members
For more information, see:
http://jspatterns.com
My column in the JavaScript Magazine (http://jsmag.com)
Blog: http://phpied.com
Love it or hate it, JavaScript is playing an increasingly important role in the next generation of web and mobile apps. As code continues to move from the server to the client, JavaScript is being used to do more than simple HTML manipulation. Be prepared for this transition and make sure the JavaScript you write is optimized and ready to perform on desktops and devices! In this session, you will learn ten practical tips that you can use today to write faster, more maintainable, memory friendly JavaScript.
An introductory presentation I'm doing at my workplace for other developers. This is geared toward programmers that are very new to javascript and covers some basics, but focuses on Functions, Objects and prototypal inheritance ideas.
This document provides an overview of JavaScript including its history, key features, and comparisons to other languages. It also discusses important JavaScript concepts like objects, functions, events, and libraries like jQuery. Key topics covered include the window, document, location, and history objects, arrays, cookies, closures, inheritance, callbacks, and popular JavaScript libraries and frameworks.
Generators in ECMAScript provide a way to write iterator functions using the yield keyword. This allows for writing functions that can be iterated over manually or used to create infinite streams. Generators also enable asynchronous programming using coroutines instead of callbacks. They allow for cooperative multitasking by starting multiple generator functions as "threads" that yield values in a nondeterministic order. Array comprehensions are also proposed as a shorthand for transforming arrays using generators.
This was a talk given at HTML5DevConf SF in 2015.
Ever wanted to write your own Browserify or Babel? Maybe have an idea for something new? This talk will get you started understanding how to use a JavaScript AST to transform and generate new code.
This document provides a summary of an introductory presentation on advanced JavaScript concepts including closures, prototypes, inheritance, and more. The presentation covers object literals and arrays, functions as objects, constructors and the this keyword, prototypes and the prototype chain, classical and prototypal inheritance, scope, and closures. Examples are provided to demonstrate each concept.
The document discusses different approaches to object-oriented programming in JavaScript, including classical and prototypal inheritance, constructor functions, and the prototype property. It explains how prototypal inheritance works by linking objects together through their internal prototype properties. Constructor functions and the new operator allow simulating classical inheritance by establishing prototype links. Various design patterns are also covered, such as public/privileged methods, singletons, modules, and parasitic inheritance.
The document provides an agenda for a talk on modeling a Rubik's Cube in JavaScript. It begins with an introduction to scripting languages and ECMAScript. It then discusses modeling a Rubik's Cube by first walking through the code, then modeling the cube and finding moves to solve it. The document covers topics like scripting languages, ECMAScript, object-oriented programming concepts in JavaScript, and modeling a Rubik's Cube to be manipulated programmatically.
Practical JavaScript Programming - Session 6/8Wilson Su
JavaScript is one of the most popular skills in today’s job market. It allows you to create both client- and server-side applications quickly and easily. Having a solid understanding of this powerful and versatile language is essential to anyone who uses it.
“Practical JavaScript Programming” does not only focus on best practices, but also introduces the fundamental concepts. This course will take you from JavaScript basics to advanced. You’ll learn about topics like Data Types, Functions, Events, AJAX and more.
Practical JavaScript Programming - Session 1/8Wilson Su
JavaScript is one of the most popular skills in today’s job market. It allows you to create both client- and server-side applications quickly and easily. Having a solid understanding of this powerful and versatile language is essential to anyone who uses it.
“Practical JavaScript Programming” does not only focus on best practices, but also introduces the fundamental concepts. This course will take you from JavaScript basics to advanced. You’ll learn about topics like Data Types, Functions, Events, AJAX and more.
This document provides an overview of Objective-C for Java developers. It discusses that Objective-C is the primary language for developing Mac and iOS apps due to its performance and ability to interface with Cocoa frameworks. It describes Objective-C classes as having interface and implementation definitions separated into .h and .m files. Methods are defined and called by passing messages to objects, with dispatch handled dynamically at runtime. The document also covers creating and working with Objective-C objects by allocating and initializing them.
This document discusses advanced JavaScript techniques. It covers object-oriented JavaScript concepts like references, function overloading, type checking, scopes, closures, object creation, and inheritance. It also discusses performance improvements like scope management, object caching, and optimizing DOM selection. Finally, it discusses debugging and testing JavaScript code as well as distributing JavaScript applications.
This presentation will give you a brief background to JavaScript, what it is and where it comes from. Then it will walk you through general pitfalls, best practices and more advanced topics such as object-orientation, scope and closures.
This document introduces ES2015 (ECMAScript 2015), which updated the JavaScript language with new syntaxes and libraries. It summarizes some of the key additions, including classes, template literals, object literal extensions, Maps, destructuring, and more. These features are now supported by modern browsers. The document provides examples of code using the old syntax versus the new syntax for classes, template literals, Maps, and destructuring to illustrate the changes. It also lists some references for further exploring ES2015.
The document discusses object oriented JavaScript. It covers JavaScript types and constructors, creating custom types, using prototypes for inheritance and instance members. It also discusses namespaces, visibility, and polymorphism in JavaScript. Useful design patterns like factories, singletons, and modules are presented. The presentation provides examples and explanations of these core JavaScript concepts.
This document provides an agenda and overview for a presentation on JavaScript. It discusses JavaScript's history and popularity, current implementations of JavaScript engines in browsers, and proliferation of JavaScript frameworks. The agenda outlines discussing objects, functions, scope, primitives, common mistakes, inheritance, best practices, modularity, and more. It also includes code examples demonstrating functions, closures, scope, operators, and error handling in JavaScript.
1. The document discusses JavaScript concepts like scope, closures, context, and object-oriented programming techniques like constructors, methods, and inheritance.
2. It provides examples of how to create public and private methods, and "privileged" methods that have access to private values and methods.
3. The document shows how to dynamically generate classes at runtime based on properties passed to a constructor using these JavaScript concepts.
2013-02-21 - .NET UG Rhein-Neckar: JavaScript Best PracticesJohannes Hoppe
The document provides JavaScript best practices focusing on code quality, avoiding antipatterns like implied globals and eval, and recommendations for style like indentation and naming conventions. It also discusses testing with Jasmine including writing tests, making them pass, refactoring code, and repeating the test-driven development process. Modular code organization techniques like revealing module pattern and event publishing are also covered.
The document provides an overview of the C++ Technical Report 1 (TR1). TR1 adds new functionality to the C++ standard library in areas such as utility classes like shared_ptr and tuple, containers including hash maps, function objects, type traits, numerics, and regular expressions. It is included in the std::tr1 namespace and provides commonly used components from Boost that fill gaps in the standard library. TR1 helps developers avoid reimplementing commonly needed functionality and provides an expanded toolkit for writing C++ applications.
SecureSocial - Authentication for Play Frameworkjaliss
This document provides an overview and agenda for SecureSocial, an authentication module for Play!. It discusses main concepts like identity providers and user services. It covers installation, configuration, protecting actions, and customizing views. It also describes extending SecureSocial by creating new identity providers and internationalizing messages. The document aims to explain how SecureSocial works and how developers can customize it for their needs.
Javascript fundamentals for php developersChris Ramakers
Javascript fundamentals from a PHP developers' point of view. Compares some of the principles of javascript with their php counterpart. Introduces a way to build simple robust modules in Javascript.
You can view the source of the slides (html+js) here: https://bitbucket.org/chrisramakers/talk-javascript-for-php-developers
Android brings to the table a whole new set of building blocks:. Each has its own unique properties. Building an app is mashing them together in a unique way. Often, there are multiple approaches to seemingly the same result. Knowing what component to use when is often a balance of art and science. In this talk, we’ll explore the main building blocks of Android: activities, services, providers, receivers as well as intents that glue them all together. We’ll learn about properties and variations of each. By the end of this talk, you should know how to write a straw-man implementation of basic building blocks, when to use them, and how to connect them together. This talk is based on Ice Cream Sandwich release of Android.
C++ CoreHard Autumn 2018. Concurrency and Parallelism in C++17 and C++20/23 -...corehard_by
What do threads, atomic variables, mutexes, and conditional variables have in common? They are the basic building blocks of any concurrent application in C++, which are even for the experienced C++ programmers a big challenge. This massively changed with C++17 and change even more with C++20/23. What did we get with C++17, what can we hope for with C++20/23? With C++17, most of the standard template library algorithms are available in sequential, parallel, and vectorised variants. With the upcoming standards, we can look forward to executors, transactional memory, significantly improved futures and coroutines. To make it short. These are just the highlights from the concurrent and parallel perspective. Thus there is the hope that in the future C++ abstractions such as executors, transactional memory, futures and coroutines are used and that threads, atomic variables, mutexes and condition variables are just implementation details.
Gabriele Petronella - FP for front-end development: should you care? - Codemo...Codemotion
Functional programming is becoming pervasive in every branch of development, but why should you care? Can we reap the benefits of FP, if our job is to write web UIs? In this presentation, we'll see how FP fits into the front-end development picture and how we can leverage TypeScript to progressively migrate our codebases and start getting the most out of it.
JavaFX is a software platform for creating and delivering desktop applications, as well as rich internet applications (RIAs) that can run across a wide variety of devices. Some key aspects of the JavaFX platform include its base classes like Application, Scene and Stage; the use of FXML for building the user interface with CSS styling and JavaScript capabilities; JavaFX properties and bindings for observing value changes; and support for animation. The JavaFX architecture provides objects, APIs and utilities to help developers create visually-engaging and responsive user experiences.
Enumerable provides a large set of useful methods for enumerations or collections of values. It is a core module that allows objects to be iterated over. Enumerable provides aliases for some methods and optimized versions for common use cases like invoking the same method on each element or fetching the same property from each element. To use Enumerable, an object just needs to provide an _each method that iterates over its elements.
[C++] The Curiously Recurring Template Pattern: Static Polymorphsim and Expre...Francesco Casalegno
••• Exploit the full potential of the CRTP! •••
In this presentation you will learn:
▸ what is the curiously recurring template pattern
▸ the actual cost (memory and time) of virtual functions
▸ how to implement static polymorphism
▸ how to implement expression templates to avoid loops and copies
This document provides an overview of the C++ Boot Camp for CSE 380. It includes:
- A disclaimer that the presenter is not the grader and their opinions are their own.
- An outline of topics to be covered in this week's session, including basic C++ structure, control flow, pointers, references, classes and more.
- Code snippets demonstrating basic C++ syntax for many of these concepts.
The document serves as an introduction to the C++ Boot Camp, outlining what will be covered and including examples to demonstrate fundamental C++ concepts and syntax.
This document provides an overview of the C++ Boot Camp for CSE 380. It includes:
- A disclaimer that the presenter is not the grader and their opinions are their own.
- An outline of topics to be covered in the boot camp over two weeks, including basic C++ syntax like if/else statements, loops, functions, pointers, references, classes and inheritance.
- Code snippets demonstrating many of these basic C++ concepts like main program structure, preprocessor directives, exceptions, constructors and destructors.
Building modern web apps with html5, javascript, and javaAlexander Gyoshev
This document discusses building modern web apps with HTML5, JavaScript, and Java. It covers managing complexity with templates, data binding, data syncing, and widgets. It recommends using logic-less templates like Mustache and Handlebars for simplicity. Frameworks like Backbone, Kendo, and AngularJS help separate data and logic through data binding and sync data with backends. The document demonstrates these concepts with code examples. It acknowledges Java's role through frameworks like Play, Scala, and Lift that improve on plain Java for web development. The document concludes by wrapping up how frameworks provide modular pieces to build applications like puzzles.
Beginner workshop to angularjs presentation at GoogleAri Lerner
AngularJS workshop to introduce beginner concepts:
The presenter is Ari Lerner from Fullstack.io and teaches AngularJS. The workshop covers tools needed for Angular development like text editors, browsers, and web servers. It demonstrates building a simple greeting app with Angular directives, controllers, expressions, and scopes. Data handling with the $http service and promises is explained. Dependency injection allows services like $http to be passed into controllers. Services are introduced as singleton objects that can persist data beyond a single controller.
What can be done with Java, but should better be done with Erlang (@pavlobaron)Pavlo Baron
Erlang excels at building distributed, fault-tolerant, concurrent applications due to its lightweight process model and built-in support for distribution. However, Java is more full-featured and is generally a better choice for applications that require more traditional object-oriented capabilities or need to interface with existing Java libraries and frameworks. Both languages have their appropriate uses depending on the requirements of the specific application being developed.
This document provides an introduction to JavaScript fundamentals and common patterns, jQuery optimization techniques, and an introduction to Node.js. It discusses JavaScript data types and variables, scoping, objects and classes. It also covers immediate execution functions, private patterns, event attaching in jQuery, and dependency management in Node.js projects. The document includes code examples for selecting elements and caching selectors in jQuery as well as creating an Express server and using middleware in Node.js applications.
Drupal 8 in action, the route to the methodjuanolalla
This document provides an overview of routing in Drupal 8. It introduces how routing is defined using YAML configuration files and controllers instead of hook_menu(). Parameters can be passed to routes and controllers. Access to routes can be restricted using access checkers. Dynamic route titles and entity defaults are also covered. Advanced topics like regular expressions on parameters and upcasting parameters to entities are demonstrated through code examples.
The fundamental nature of a Christian is that of celebration and joy. Because Christ has drank of the cup meant for us, we can live joy-filled lives in a world that so desperately needs new wine.
In this examination of many "Do not be afraid" statements from the Bible, we look at reasons why the Christian believer should not be afraid, and should instead pursue risks and bold living for the Kingdom.
Reverse engineering your life is the process of determining what you want your life to look like, and then working backwards from your end goal. What should you be doing now in order to reach your desired destination?
Honoring Those in Spiritual and Economic AuthorityDerek Brown
In this presentation, Derek Brown examines what it looks like for us as Godly men to honor both our spiritual authorities (pastors) and our economic authorities (employers) with respect to the Gospel.
How does the sending of missionaries and the equipping of the saints overlap? In this slide deck, we examine how the Father sends the Son sends the Spirit sends the Church, and how spiritual gifts are sent to the Church for the sake of advancing the Kingdom of God.
The document discusses the importance of focusing on Jesus and the gospel message. It encourages believers to lead others to Jesus, train themselves in godliness, and work out their salvation as God works in them. The gospel is described as the foundation of Christianity that believers should never leave.
The story of the Flood in Genesis is quite the epic. But what does it tell us today? And what does it say, if anything, about the events of the 1st century regarding Jesus?
Derek examines those questions through the story of Noah.
This passage discusses how Christians ought to behave in the church. It describes the church as the pillar and foundation of truth, and as the church of the living God. It also references how understanding who Christ is should affect how Christians live their lives.
The document discusses the grace and mercy of Jesus Christ. It notes that Jesus provides strength to the weak, not the strong, and that God chooses to use what is weak in order to shame what is strong. Even when we are faithful, our faith comes from Jesus rather than our own inherent characteristics. The grace of Jesus covers all past and future sins. There is enough faith, love, and mercy in Jesus to last a lifetime. It is impossible to exhaust God's grace. The document encourages looking at one's own sin rather than judging others and moving from examining others' sins to examining one's own sins with the help of God's grace.
This document provides an overview of a sermon on properly interpreting and applying the Bible. It discusses how the Bible is about Jesus and interprets itself, and warns against getting caught up in "myths and endless speculations" or elevating "open-handed issues" to "closed-handed issues." It emphasizes that the purpose of Scripture is to lead people to love through a pure heart, clear conscience, and true faith in Jesus.
Are you interested in dipping your toes in the cloud native observability waters, but as an engineer you are not sure where to get started with tracing problems through your microservices and application landscapes on Kubernetes? Then this is the session for you, where we take you on your first steps in an active open-source project that offers a buffet of languages, challenges, and opportunities for getting started with telemetry data.
The project is called openTelemetry, but before diving into the specifics, we’ll start with de-mystifying key concepts and terms such as observability, telemetry, instrumentation, cardinality, percentile to lay a foundation. After understanding the nuts and bolts of observability and distributed traces, we’ll explore the openTelemetry community; its Special Interest Groups (SIGs), repositories, and how to become not only an end-user, but possibly a contributor.We will wrap up with an overview of the components in this project, such as the Collector, the OpenTelemetry protocol (OTLP), its APIs, and its SDKs.
Attendees will leave with an understanding of key observability concepts, become grounded in distributed tracing terminology, be aware of the components of openTelemetry, and know how to take their first steps to an open-source contribution!
Key Takeaways: Open source, vendor neutral instrumentation is an exciting new reality as the industry standardizes on openTelemetry for observability. OpenTelemetry is on a mission to enable effective observability by making high-quality, portable telemetry ubiquitous. The world of observability and monitoring today has a steep learning curve and in order to achieve ubiquity, the project would benefit from growing our contributor community.
Fluttercon 2024: Showing that you care about security - OpenSSF Scorecards fo...Chris Swan
Have you noticed the OpenSSF Scorecard badges on the official Dart and Flutter repos? It's Google's way of showing that they care about security. Practices such as pinning dependencies, branch protection, required reviews, continuous integration tests etc. are measured to provide a score and accompanying badge.
You can do the same for your projects, and this presentation will show you how, with an emphasis on the unique challenges that come up when working with Dart and Flutter.
The session will provide a walkthrough of the steps involved in securing a first repository, and then what it takes to repeat that process across an organization with multiple repos. It will also look at the ongoing maintenance involved once scorecards have been implemented, and how aspects of that maintenance can be better automated to minimize toil.
論文紹介:A Systematic Survey of Prompt Engineering on Vision-Language Foundation ...Toru Tamaki
Jindong Gu, Zhen Han, Shuo Chen, Ahmad Beirami, Bailan He, Gengyuan Zhang, Ruotong Liao, Yao Qin, Volker Tresp, Philip Torr "A Systematic Survey of Prompt Engineering on Vision-Language Foundation Models" arXiv2023
https://arxiv.org/abs/2307.12980
How RPA Help in the Transportation and Logistics Industry.pptxSynapseIndia
Revolutionize your transportation processes with our cutting-edge RPA software. Automate repetitive tasks, reduce costs, and enhance efficiency in the logistics sector with our advanced solutions.
Measuring the Impact of Network Latency at TwitterScyllaDB
Widya Salim and Victor Ma will outline the causal impact analysis, framework, and key learnings used to quantify the impact of reducing Twitter's network latency.
Paradigm Shifts in User Modeling: A Journey from Historical Foundations to Em...Erasmo Purificato
Slide of the tutorial entitled "Paradigm Shifts in User Modeling: A Journey from Historical Foundations to Emerging Trends" held at UMAP'24: 32nd ACM Conference on User Modeling, Adaptation and Personalization (July 1, 2024 | Cagliari, Italy)
Quality Patents: Patents That Stand the Test of TimeAurora Consulting
Is your patent a vanity piece of paper for your office wall? Or is it a reliable, defendable, assertable, property right? The difference is often quality.
Is your patent simply a transactional cost and a large pile of legal bills for your startup? Or is it a leverageable asset worthy of attracting precious investment dollars, worth its cost in multiples of valuation? The difference is often quality.
Is your patent application only good enough to get through the examination process? Or has it been crafted to stand the tests of time and varied audiences if you later need to assert that document against an infringer, find yourself litigating with it in an Article 3 Court at the hands of a judge and jury, God forbid, end up having to defend its validity at the PTAB, or even needing to use it to block pirated imports at the International Trade Commission? The difference is often quality.
Quality will be our focus for a good chunk of the remainder of this season. What goes into a quality patent, and where possible, how do you get it without breaking the bank?
** Episode Overview **
In this first episode of our quality series, Kristen Hansen and the panel discuss:
⦿ What do we mean when we say patent quality?
⦿ Why is patent quality important?
⦿ How to balance quality and budget
⦿ The importance of searching, continuations, and draftsperson domain expertise
⦿ Very practical tips, tricks, examples, and Kristen’s Musts for drafting quality applications
https://www.aurorapatents.com/patently-strategic-podcast.html
Understanding Insider Security Threats: Types, Examples, Effects, and Mitigat...Bert Blevins
Today’s digitally connected world presents a wide range of security challenges for enterprises. Insider security threats are particularly noteworthy because they have the potential to cause significant harm. Unlike external threats, insider risks originate from within the company, making them more subtle and challenging to identify. This blog aims to provide a comprehensive understanding of insider security threats, including their types, examples, effects, and mitigation techniques.
YOUR RELIABLE WEB DESIGN & DEVELOPMENT TEAM — FOR LASTING SUCCESS
WPRiders is a web development company specialized in WordPress and WooCommerce websites and plugins for customers around the world. The company is headquartered in Bucharest, Romania, but our team members are located all over the world. Our customers are primarily from the US and Western Europe, but we have clients from Australia, Canada and other areas as well.
Some facts about WPRiders and why we are one of the best firms around:
More than 700 five-star reviews! You can check them here.
1500 WordPress projects delivered.
We respond 80% faster than other firms! Data provided by Freshdesk.
We’ve been in business since 2015.
We are located in 7 countries and have 22 team members.
With so many projects delivered, our team knows what works and what doesn’t when it comes to WordPress and WooCommerce.
Our team members are:
- highly experienced developers (employees & contractors with 5 -10+ years of experience),
- great designers with an eye for UX/UI with 10+ years of experience
- project managers with development background who speak both tech and non-tech
- QA specialists
- Conversion Rate Optimisation - CRO experts
They are all working together to provide you with the best possible service. We are passionate about WordPress, and we love creating custom solutions that help our clients achieve their goals.
At WPRiders, we are committed to building long-term relationships with our clients. We believe in accountability, in doing the right thing, as well as in transparency and open communication. You can read more about WPRiders on the About us page.
Scaling Connections in PostgreSQL Postgres Bangalore(PGBLR) Meetup-2 - MydbopsMydbops
This presentation, delivered at the Postgres Bangalore (PGBLR) Meetup-2 on June 29th, 2024, dives deep into connection pooling for PostgreSQL databases. Aakash M, a PostgreSQL Tech Lead at Mydbops, explores the challenges of managing numerous connections and explains how connection pooling optimizes performance and resource utilization.
Key Takeaways:
* Understand why connection pooling is essential for high-traffic applications
* Explore various connection poolers available for PostgreSQL, including pgbouncer
* Learn the configuration options and functionalities of pgbouncer
* Discover best practices for monitoring and troubleshooting connection pooling setups
* Gain insights into real-world use cases and considerations for production environments
This presentation is ideal for:
* Database administrators (DBAs)
* Developers working with PostgreSQL
* DevOps engineers
* Anyone interested in optimizing PostgreSQL performance
Contact info@mydbops.com for PostgreSQL Managed, Consulting and Remote DBA Services
Advanced Techniques for Cyber Security Analysis and Anomaly DetectionBert Blevins
Cybersecurity is a major concern in today's connected digital world. Threats to organizations are constantly evolving and have the potential to compromise sensitive information, disrupt operations, and lead to significant financial losses. Traditional cybersecurity techniques often fall short against modern attackers. Therefore, advanced techniques for cyber security analysis and anomaly detection are essential for protecting digital assets. This blog explores these cutting-edge methods, providing a comprehensive overview of their application and importance.
4. Why Patterns?
Great design patterns are reusable, modular expressions of
what's going on in your code. They allow you to
communicate to other developers simply by the way you
code, in addition to being easily maintainable themselves.
Put simply, patterns are the available tools in the
developer's toolbox.
5. The Patterns We'll Cover
There are hundreds of design patterns that can be
leveraged for use here in your code base. Ain't nobody got
time for that, so we'll cover only a few that are pretty
different from one another, but are prevalent in
applications, to get a glance at what's out there.
For each pattern, we'll look at the following:
Definition
Code Sample
Advantages & Disadvantages
Common Usage
8. Facade
A facade is exactly what it sounds like: makeup on a bulldog.
You're covering over complex, ugly things with a simplified
interface for future, more scalable development.
10. Factory
The factory pattern lets you encapsulate multiple types of
objects within a categorical constructor.
11. Observer
This is a pattern that we've talked about previously, within
the context of Ember. But how can you implement a
publish/subscribe model yourself? And when should you?
13. Module / Revealing Module
This is one of the most fundamental design patterns in the
JavaScript universe. It's primary use is to include both
private and public variables within a single class-like object
while at the same time protecting the private
methods/properties from the application.
Modules accomplish this encapsulation by using closures to
protect the private pieces while allowing the developer to
determine which pieces of the object should be publicly
exposed to the rest of the application.
17. Advantages: Module
Clean, readable, & consistent syntax.
Less clutter in the global namespace.
Allows developers to control scope of properties & methods.
Localization of functions & variables
18. Disadvantages: Module
Unit testing can be difficult if the methods aren't exposed.
Private methods are unaccessible.
Can't easily extend private methods.
20. Singleton
The singleton pattern is extremely useful if you only one
instance of the object to ever exist. Basically, what occurs
within the Singleton pattern is that you write your object,
and then as a part of that object, you have an additional
method. This function simply checks if an instance of the
object already exists. If it does, use that instance. If not, then
create a new one and store the reference.
21. Singleton
vrmSnltn=(ucin( {
a yigeo
fnto )
vrisac,
a ntne
mPoet ='au'
yrpry
Vle;
fnto gtrpry( {
ucin ePoet )
rtr mPoet;
eun yrpry
}
fnto strpry(eVle {
ucin ePoet nwau)
mPoet =nwau;
yrpry
eVle
}
fnto iiilz ( {
ucin ntaie )
rtr {
eun
gt gtrpry
e: ePoet,
st strpry
e: ePoet
}
;
}
rtr {
eun
gtntne fnto ( {
eIsac: ucin )
i (!ntne){
f
isac
isac =iiilz(;
ntne
ntaie)
25. Facade
The facade pattern is often paired with other patterns to
add an extra layer of security while at the same time
providing a simpler interface to the underlying functionality.
26. Facade
vrmFcd =(ucin( {
a yaae
fnto )
vrmPoet ='au'
a yrpry
Vle;
fnto gtrpry( {
ucin ePoet )
rtr mPoet;
eun yrpry
}
;
fnto strpry(eVle {
ucin ePoet nwau)
mPoet =nwau;
yrpry
eVle
}
rtr {
eun
gt fnto ( {rtr gtrpry) }
e: ucin )
eun ePoet(; ,
st fnto (eVle {strprynwau) }
e: ucin nwau)
ePoet(eVle;
}
;
}(;
))
27. Advantages: Facade
Enhances security, as internal functions aren't exposed.
Easy to implement
Works well with other design patterns.
Easy to patch internals
Provides a simple public interface
30. Command
The command pattern completely separates the
implementation and execution of methods. Usually, in order
to execute a method, you directly invoke the method itself.
The command pattern takes the name of the method to
execute as an argument into an "execute" or "run" method
on the command object, applying the rest of the arguments
list to the function being invoked.
In most programming, objects represent nouns. In the
command pattern, objects are verbs.
31. Command
vrmCmad={
a yomn
rqetaa fnto (d atiue {
eusDt: ucin i, trbt)
rtr 'aaatiue'+atiue+'hsbe rqetdfrojc '
eun Dt trbt
trbt
a en euse o bet
}
,
ceraa fnto (d atiue {
laDt: ucin i, trbt)
rtr 'h dt atiue'+atiue+'hsbe rstfrojc '
eun Te aa trbt
trbt
a en ee o bet
}
}
mCmadrn=fnto (omn){
yomn.u
ucin cmad
rtr mCmadcmadrqet(omn.d cmadatiue
eun yomn[omn.eus]cmadi, omn.trbt)
}
;
/
*
Atraiey ternfnto cudlo lk ti,wihwudps eta
lentvl, h u ucin ol ok ie hs hc ol as xr
mCmadrn=fnto (omn){
yomn.u
ucin cmad
rtr mCmadcmad.pl(mCmad [.lc.alagmns 1)
eun yomn[omn]apy yomn, ]siecl(ruet, );
}
;
o fragmnls cmad,yucng ee smlr
r o ruetes omns o a o vn ipe:
mCmadrn=fnto (omn){
yomn.u
ucin cmad
32. Advantages: Command
Decouples implementation from execution, which allows for
extensibility while minimizing code changes.
Stacking command objects allows you to cache them, store them in a
history, or otherwise manipulate them. Undo, anyone?
35. Factory
The factory pattern is as a interface that can be used to
create objects, usually which belong to a set or category.
The factory takes in the attributes of the object to be
created, and then returns a new instance of our object.
37. Advantages: Factory
Allows the sharing of properties across multiple objects.
Extremely useful when object or component setup is complex.
Also useful when you need to generate different instances based on
context.
40. Observer
In the observer pattern, a type of publish-subscribe pattern,
there is an object (often called the subject or observable)
that notifies other objects (observers) of any changes that
occur to the state of the subject. The observers are often
maintained in a list on the observable, to be iterated upon
when a change occurs.
41. Observer
vrosre ={
a bevr
adusrbr fnto (alak {
dSbcie: ucin clbc)
ti.usrbr[hssbcieslnt]=clbc;
hssbciesti.usrbr.egh
alak
}
,
rmvSbcie:fnto (alak {
eoeusrbr ucin clbc)
fr(a i=0 i<ti.usrbr.egh i+ {
o vr
;
hssbcieslnt; +)
i (hssbciesi ==clbc){
f ti.usrbr[] = alak
dlt(hssbciesi)
eeeti.usrbr[];
}
}
}
,
pbih fnto (ht {
uls: ucin wa)
fr(a i=0 i<ti.usrbr.egh i+ {
o vr
;
hssbcieslnt; +)
Source: For another example using Ember's implementation, check out Chad Hietala's Connection
i ( y e f t i . u s r b rrepository. ' u c i n ) {
f tpo hssbciesi == fnto'
Viewer [ ] =
ti.usrbr[]wa)
hssbciesi(ht;
}
}
}
,
mkPbihr fnto (){/ trsa ojc it apbihr
aeulse: ucin o
/ un n bet no
ulse
fr(a ii ti){
o vr
n hs
oi =ti[]
[]
hsi;
osbcies=[;
.usrbr
]
45. Delegate
In the delegate pattern, an object (the delegator) offloads a
task to an associated helper object (the delegate), rather
than performing the task itself. Often times, this is within an
MVC framework or architecture, involving a Controller as
the delegator.
46. Delegate
vrVeCas=fnto ( {
a iwls
ucin )
rtr {
eun
ii :fnto (l {
nt
ucin e)
vr$l=$e)
a e
(l;
/ RQIE:dlgt sol hv aveWslce mto ipee
/ EURD eeae hud ae
iwaCikd ehd mlmn
$lo(cik,ti.eeaeveWslce)
e.n'lc' hsdlgt.iwaCikd;
}
,
dlgt :nl
eeae
ul
}
;
}
;
vrCnrleCas=fnto ( {
a otolrls
ucin )
rtr {
eun
veWslce :fnto (){
iwaCikd
ucin e
Source: David Drew's fantastic article on implementing Objective-C Delegates in JavaScript
cnoelg' wscle!)
osl.o(I a ald';
}
}
}
;
vrcnrle =nwCnrleCas)
a otolr
e otolrls(;
vrve =nwVeCas)
a iw
e iwls(;
ve.eeae=cnrle;
iwdlgt
otolr
ve.ntdcmn.eEeetyd'yedr);
iwii(ouetgtlmnBI(mHae')
49. Common Usage
Most MVC frameworks at least involve delegation in their
design in some regard, due to the interaction between
models, views, and controllers.
50. Helpful Resources & Reading
Learning JavaScript Design Patterns by Addy Osmani
JavaScript Patterns on GitHub
Carl Danley: JavaScript Design Patterns
JavaScript Design Patterns on Adobe DevNet
Pro JavaScript Design Patterns
Zakas on the Factory Pattern
JavaScript Design Patterns