Questions tagged [functional-programming]
Functional programming is a programming paradigm based upon building abstractions using functions, isolating side effects and mutable state. Executing pure functions is thread-safe.
functional-programming
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how to apply open-close principle on hierarchical typescript data types
let's imagine the following types autogenerated: I cannot change them.
type BaseProblem = {
name?: string;
description?: string;
}
type SimProblem = BaseProblem & {
type: "sim&...
- 2,518
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1
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What's the difference between placing a parser in its "box" vs using it without it? [duplicate]
So this is my parser, and two functions to run a parser:
data Parser a = MkParser (String -> Maybe (String, a))
unParser :: Parser a -> String -> Maybe (String, a)
unParser (MkParser a) inp =...
- 63
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difficulty to understand the code, and maybe the concept itself (recursion problem)
this code below is from Grokking Algorithms book that is an exercise for the functional programming/recursion and an application for the D&C concept. the function finds the maximum number in a ...
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Are Jsonnet variables the same as functions with no parameters?
Are Jsonnet variables, the ones that end with a semicolon (as opposed to the ones that end with a comma), the same as functions with no parameters?
In the following Jsonnet program
{
c: local a = ...
- 5,967
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Referential transparency of Jsonnet functions
The Jsonnet Language Reference has this to say about Jsonnet functions:
Functions in Jsonnet are referentially transparent, meaning that any function call can be replaced with its definition, without ...
- 5,967
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What design should I use for this requirement: Static vs Non Static: Functional or OOP [closed]
Which design would you recommend for the following requirements: Static Methods, or traditional classes (immutable or something like a builder pattern). Are there any alternative designs or ...
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2
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How to use answers of parsers when nesting parsers (sequentially)
This is my Parser
data Parser a = MkParser (String -> Maybe (String, a))
This is a parser that parses if a particular predicate holds true.
satisfy :: (Char -> Bool) -> Parser Char
-- takes a ...
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1
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How do you write functional code that is not point-free (tacit)?
Edit
Based on comments and close-vote flags, I'm seeing that I didn't clearly articulate what I'm trying to ask. So let me state it as succinctly and as straight-forwards as possible.
What does it ...
- 12.5k
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Base class not recoginsed while using wild card generic
Why is the below not working?
A b1 = new B();
Function<? super B, ? extends A> function = x -> new B();
A apply = function.apply(b1);
It gives an error "Required type capture of ? ...
- 125
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7
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How can I write a std::apply on a std::expected?
In C++23, given:
expected<A, string> getA(const X& x);
expected<B, string> getB(const Y& y);
C compute_all(const A& a, const B& b);
Is there a way to avoid a classic ...
- 523
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Understanding bracket use in Haskell - Parser that depends on previous parser gives error when using brackets
Ok so I'm trying to learn Haskell.
This is my Parser.
import Data.Char
data Parser a = MkParser (String -> Maybe (String, a))
This is a parser which parses a string once, and depending on what it ...
- 63
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1
answer
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How to Create a Generic Transformer Function for Subtypes in TypeScript (without type assertions)?
I am working on a personal project to learn functional programming with TypeScript and am experimenting with the pipe function and higher-order functions to create transformers in an expressive way. I ...
- 2,923
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How to use input string in a parser
I'm new to Haskell. This is my parser:
data Parser a = MkParser (String -> Maybe a)
This parses any string, gives the first character:
-- anyChar
anyChar :: Parser Char
anyChar = MkParser sf
...
- 63
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How to put setter function as a parameter?
I need to rewrite the test so that the setter function is passed as a parameter. That is, inside the test, I create a valid book, take an invalid value from the parameter, take the function, and this ...
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Why does this recursive Function in Bend Hangs with list size > 11?
I was experimenting with the language called Bend. It claims to be "A high-level, massively parallel programming language". I was thinking of using it to validate a list of strings( 10 ...
