Questions tagged [functional-programming]
Functional programming is a paradigm which attempts to solve computational problems by the chained evaluation of functions whose output is determined by their inputs rather than the program state. In this style of programming, side effects and mutable data are deprecated.
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Haskell: implementing Read for a custom dynamic value type
I'm using Haskell to interpret a dynamically-typed language. I have a sum type called Value which can represent some basic objects:
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Suggestions for improvement for generic array and map functions in Go 1.18
Yesterday I build some generic functions for the new official Golang 1.18 release. What do you think about it and what could be added and improved?
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Re-write the aggregation function in scala-based functional style [closed]
I am new to scala and is currently taking a course on scala programming. As part of one of my assignment, I have written the following code to combine customer data with their respective accounts data....
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Stream Partitioner
Discussion
I've been trying to increase my knowledge of Java Streams and for practice, I devised up the requirement of partitioning a Stream of values into a ...
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GeekTrust: Traffic problem - functional programming
First attempt to write functional programming, been following OO paradigm all through my programming journey
Please review the code and let me know if any comments and violations of functional ...
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A Union Data Type
Introduction
I'm trying to get familiar with functional programming by implementing some functional concepts.
One of these concepts that I've attempted to implement below is a ...
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Validate Finnish IBANs
I am currently studying an online course in Haskell and there are no "model examples" of the assignments after finishing them. I'm slowly getting the hang of this, but I'd like some feedback ...
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Refactoring this code into OOP & less functional programming
I got feedback from an interview test where they wanted me to prove that I've got a grasp of OOP php programming. This file especially I got feedback on that it's more functional than it is Object-...
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Command line wordle
I am seeking a review of my command line wordle game.
Having only recently started exploring functional programming, I expect that there will be no shortage of areas to improve. This is my first ...
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Download entire localStorage as file
I would like to download the entire contents from localStorage to a json file (in a "clear" formatting).
I've tried this and it works perfectly. However, ...
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Project Euler 1, 2 and 3: Functional Programming style using F#
After doing about 50 Project Euler problems in my "native" language (C#) I decided to redo some of the problems I did many years ago in F#, as it's a language I always want to give a go. ...
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Ocaml add index to every item of a collection
I want to add a unique ID to every element in a collection (before output it as a JSON object).
A collection can be any set of items, as long as it has a map method ...
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Functools extension library
I wrote a utility library inspired by functools that adds some common operations on functions I frequently use in my projects.
As usual I'd appreciate any feed back....
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make an array of cells from formula like in excel with javascript?
I'm working on stylesheet in Excel, and I've made this function of makeCells is there a better way of doing it. I've tried regex to get two cells ...
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Efficiently calculating perfect powers in Haskell
I'm trying to calculate perfect powers to solve this code wars challenge: https://www.codewars.com/kata/55f4e56315a375c1ed000159/haskell
The number 81 has a special property, a certain power of the ...
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Advent of Code 2021, Day 3 in Haskell
This is a working solution to today's Advent of Code puzzle, written in Haskell. However, I feel like this solution is not optimal.
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Improving the Conway's Game of Life Code With Functions in Python
This query is a part of Conway’s game of life. Currently, this program takes about 70 lines of code in Python to return the functionality of the game, which can be simplified to fewer lines of code ...
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Processing list of users- filtering out from refused list
The code below takes a list of users and displays two lists
Refused users
Admitted users
Sample output:
Refuse: Phil, Lola.
Admit: Chris, Anne, Colin, Terri, Sam, Kay, Bruce.
Any feedback is ...
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Relational join of two datasets
Front Matter
I'm learning Scala and have not gotten used to functional programming and the language. I'm hoping a review of my naively implemented code can help me bridge my object-oriented ways to ...
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3
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Finds Keywords in Log Files
This is my first project in C and I wanted a more experienced person's insight on how I made the whole program. Just looking for feedback it works how I want it to. The Github is here. Thank you so ...
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Higher-order function to do throttling, written two ways
I have used below method for throttling which is a Higher Order Function (HOF), but find some difficulties to choose which one is better way to write it. Below are both methods.
return of the ...
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Multiple flatMap style: Nested or sequential?
This question applies to any language with flatMap -- e.g. functional languages -- but I'll use an example in JavaScript.
I'm working my way through Functional Programming in JavaScript, which is a ...
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Download and parse XML data from a URL every minute with F#
The purpose
This code is intended to achieve the following goals:-
Create a hard coded list of lifts, this is pretty static and I add some extra info so I'm ok with this being in the code but I may ...
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Gilded Rose with pure functions in C#
Gave myself the challenge of solving the Gilded Rose with pure functions in C#. All one-line lambdas, all static, all the time. The original kata assumed the code would mutate the given array-- I've ...
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Garden simulator [closed]
I tried to write the program so that it runs without error but I want to improve the program so that it follows the Single Responsibility Principle. What changes can I make to improve this program? I ...
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Is there a better way to apply a filter over an Either right value?
Suppose you have an IO (Either String (String, [Int])) and you want to filter the [Int].
Let's say we want to use the following ...
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Reading a CSV file using Haskell
I'm reading a CSV using Haskell. I'm not sure if this is the appropriate way to do it.
This is what I'm doing:
Read rows from a CSV -> return lazy byte string
Parse the headers and rows from the ...
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Typescript Maybe functor
I have been trying to implement a version of the Maybe functor in Typescript. I'm looking for feedback on whether I can improve the type safety of my implementation. I'm not particularly happy that ...
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Word frequency finder
Challenge: find the top three most frequently used words in a string. Only imports from the base package are allowed (source: codewars)
I'm looking for feedback on (...
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97
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Split string at given positions
Given a vector <Vec<usize>> of indices indicating where to split a string as follows:
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TypeScript generic higher-order function returned function returned type
I have a higher-order function to create another function given a regular expression:
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Small combinator parsing library in Haskell
I recently wrote code to parse lambda expressions written in a lisp like format, using a small hand-rolled parsing library.
The goal
This code was written as a part of this code-golf challenge not as ...
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Refactor Javascript filter that handles click and changing together dropdown filters
I'm looking to rework and make it easier to read this handleFilterChange function
This is helper being used in the function
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piping a std::tuple into a function
This is a mythical beast we discussed in a previous question:
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garbage string remover with array or object input
This is the second time I am writing any practical JavaScript so it is pretty likely that I have messed something up.
I am beginner, so just need a piece of advice before sharing the code: Do I need ...
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Cardinal to ordinal numbers in F# code reuse
I've been experimenting with the F# Bolero environment to learn F# a bit and I was trying to get the hang of pattern matching by generating ordinal numbers (1st, 2nd, 3rd, ...) from cardinal numbers (...
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F# simple monoalphabetic cipher code implementation
I am a new F# programmer, and a student in a security class. As part of my notes, I wrote a small implementation of a monoalphabetic cipher as follows:
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Project Euler 1 using functional programming in JS
So I am once again beating a dead horse, by solving the first Project Euler problem:
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these ...
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Simplifying and optimising function logic [closed]
I asked the same question on StackOverflow but was told to instead ask here since it was better suited. I have a function that I implemented. It is doing a lot of heavy lifting. I would like to ...
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Python – return list (or not?) of prime numbers between two numbers
I'm trying to learn how to write code well in Python. I've been tinkering with a function that will return a list of all prime numbers between the two parameters. This is the best I could come up with ...
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map multiple functions to a single input
map is a builtin function that takes one function func and one or more iterables, and maps the function to each element in the ...
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Haskell Function to get the List representation of an Integral
This is a simple practice problem. The task is to write a function getLR that receives an Integral, ...
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1
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Add result-logging to any function
I'm writing a simple function to transform functions by logging the result before returning it.
The function as written by me:
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2
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Scala Parentheses Balancing in Functional Programming
I was working on the problem to check if the parenthesis are balanced using Scala.
Examples:
balance("(Hello (my) name is (StackOverflow))") -> ...
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Restructuring JSON to create a new JSON where properties are grouped according to similar values
I have a JSON structure in the following example format:
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Deserialize a binary breadth-first in functional programming
A while back, I answered this question on Stack Overflow that involved deserializing a binary tree breadth-first using functional programming (the question itself isn't relevant). I'd like to make ...
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Using Functional programming to untangle deeply nested loops (Kotlin)
Problem statement for better understanding:
Let's say we assign a unique number to each alphabet,
a=1, b=2, c=3...z=26
then find the frequency of the sum of each ...
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Count number of days within each date range in a list of date ranges
Happily picked up Haskell a couple days back and working on the following use case.
Given a list of JSON objects with date fields and a start date, I want to create a list of weeks (here a tuple of ...
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