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Haskell is a purely functional programming language, featuring static typing, lazy evaluation, and monadic effects. The primary implementation is GHC, a high-performance compiler with a runtime supporting many forms of parallelism and concurrency.

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haskeline is a reimplementation in haskell of the GNU Readline library (the one that by default allows you to delete the word you just typed on your shell's command line by pressing Ctrl+w, for ...
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upd: I am very sorry about my mistake. The old version of data is download from luogu, but the website do NOT allow me to download the data of the worst case. In fact, when facing same amount of ...
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This is part 2 of Day 4 of 2024's AoC: The problem is as follows: It's an X-MAS puzzle in which you're supposed to find two MAS in the shape of an X. One way to achieve that is like this: ...
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As part of a larger project, we're using type-level strings to identify "parties" (synonymously, "locations"). Critical to the system is the ability to express and enforce ...
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The question asked is very straight-forward and is simple enough to solve. What I am looking for is that hopefully I can get some understanding for using the constructs and built-ins of the Haskell ...
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I've been learning some Haskell as an amateur (to be precise: I started programming with this language, and it has been a year or less since I started seriously). So far, I have realised only small ...
user665110's user avatar
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I want to get better at functional programming so I started with this simple 2-player TicTacToe game. Next I want to add a simple min-max algorithm to make it a 1-player game, but before that I'd like ...
Peter's user avatar
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The following code parses a 2D Cartesian coordinate passed as Cart2Pol <x> <y> and prints the coordinate in ...
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A previous solution of this code has been posted on Code Review before. This solution is more complicated then that one, but more performant (see the below) Why is this another Question instead of a ...
WesAtWork's user avatar
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Background Saw this problem on TheJobOverflow which seems to be a LeetCode question. It bothered me that the "challenge" of this problem was to recognize the need for a specific data-type (...
WesAtWork's user avatar
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Very new in Haskell, as a first easy program I went for an old algorithm of mine to approximate pi by counting points within a circle. The snippet below is what I could get working. I had quite an ...
Tsaras's user avatar
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I am quite new to Haskell, and this problem is from dailycodingproblem.com: Implement an autocomplete system. That is, given a query string s and a set of all ...
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I have this code, which is a pseudo-Sieve of Eratosthenes for generating primes: ...
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I am working on a Haskell problem from exercism, which is a learn-to-code website. The problem statement is as follows. Write a function to solve alphametics puzzles. Alphametics is a puzzle where ...
Brendan Langfield's user avatar
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I'm quite new to Monads and I tried add function call counting to the Ackermann function code. The goal was simplicity, not performance. I want to have code review on the ...
Arpad Horvath's user avatar
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I have written a tic-tac-toe game in Haskell and was wondering if anyone could provide any hints on how it could be improved ...
Dean Menezes's user avatar
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This is the No of Island code challenge. Please review my implementation in Haskell. I know there must be some better way of doing this. Given an m x n 2D binary grid grid which represents a map of '...
presci's user avatar
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Here is my attempt to write the infamous factorial using Data.IORef. ...
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I'm working on the famous clump finding problem to learn Haskell. Part of the problem involve breaking nucleotide sequences, called kmers, into subsequences as follows: ...
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I am implementing a function that receives a list of list integers and updates the list appending to the ith element a number x, for example: ...
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Two Sum Problem: Given an array of integers A and an integer K return True if there are two elements two elements xi, xj (i != j) such that xi + xj = K. Return False otherwise. I am implementing the ...
dpalma's user avatar
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Background I'm building a lisp-like toy language in Haskell with the following (stripped down) AST: ...
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Let's say you have a simple pure function that applies a discount of 30% if the total price of a list of Items is over 30.00 (let's not delve into the fact that I'm ...
Jir's user avatar
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I was recently tasked with creating a function that could generate a "varied" version of some collection of parameters. As in, it should take in a list of parameters, and then vary the value ...
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Context Chapter 6 of Learn You A Haskell contains a function called chain, which outputs the Collatz sequence of a given input. (In short, it takes a natural number....
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I'm trying to use this library in my haskell program to generate a source map file, but getting some performance issue. The size of the mapping file generated was about 30M bytes, and it took almost ...
freedomhero's user avatar
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The following function executes each action from the list until a predicate returns True. I have a feeling that this function can be rewritten using ...
Aleksei Tirman's user avatar
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Intro I have been learning haskell and functional programming using random Project Euler problems. Currently, I have solved Problem 11. What is the greatest product of four adjacent numbers in the ...
Naitik Mundra's user avatar
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I teach a data structures and algorithms course. Students can choose C++ or Java. As an exercise for myself, I am doing the assignments in Haskell. My primary goal is to understand what aspects of my ...
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I've recently tried to write my functions by using composition. But this one, renderCross' is especially difficult to convert fully. How would I write this ...
ola_bandola's user avatar
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I recently made a simple hangman game in Haskell but soon wanted to explore the state monad, since it could possibly simplify the code. The result was this (see below), which is exactly 30% more lines ...
ola_bandola's user avatar
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I just finished a course of functional programming in uni and continued to study Haskell because I found it very interesting! I made a simple hangman game and would like to hear any of your thoughts ...
ola_bandola's user avatar
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6 votes
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I've been learning Haskell for 2 weeks now which is I'm very new to it. I would like to have feedback on what is good/bad about my code and how it could I improve in learning functional programming ...
JHV's user avatar
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As a beginner exercise, I made small manual lexer that recognizes three types of inputs: integers: /[-]?[0-9]+/ strings, inside double quotes, with backslash ...
Pierre Arlaud's user avatar
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I am new to Haskell and took it upon myself to make a simple generic list-splitting (e.g. string-splitting) function: ...
Ethan McTague's user avatar
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1 answer
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I won't restate the problem in full, but in a nutshell you have to parse a file with a "direction" and a "magnitude", for instance: ...
Jir's user avatar
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1 answer
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I'm using Haskell to interpret a dynamically-typed language. I have a sum type called Value which can represent some basic objects: ...
pxeger's user avatar
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I've tried to solve a challenge posted on a LinkedIn forum using Haskell - a language I'm still learning the basics of - and, while the code works correctly, I would like to get some feedback on the ...
Jir's user avatar
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Please review the manacher algorithm in haskell. Find the longest Palindrome in a String. ...
presci's user avatar
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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 ...
Apelli's user avatar
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Here is my attempt at Advent of Code Day 4 using Haskell. A file contains list of number in first line. And subsequent lines have the bingo Cards ...
presci's user avatar
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Is this a correct implementation in Haskell of a proof checker for first order logic with equality? I am most interested in if it is correct, and if the functions can be made clearer. I would like it ...
user695931's user avatar
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1 answer
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I am beginner to Haskell. Here is my solution to Advent of Code 2021 Day 3. Let me know what you think. I was looking at the transpose function and decided not to use head & tail function. Given ...
presci's user avatar
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2 votes
1 answer
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I'm learning Haskell and even though I have experience with Functional Programming the Typesystem has been a challenge. I did this yesterday (after like 2 days) and I would like to know whether this ...
Aguxez's user avatar
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1 answer
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I've written this code in Haskell to convert a number into its written form. It feels ok but at the same time I feel like it can probably be improved on a lot. I would appreciate help in improving it. ...
noatbfgtxa's user avatar
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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 ...
jdkleuver's user avatar
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This is a working solution to today's Advent of Code puzzle, written in Haskell. However, I feel like this solution is not optimal. ...
Scriptim's user avatar
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1 answer
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There are already many Tic Tac Toe posts. But as far as I can tell, none of the ones in Haskell are complete with a GUI Here is my implementation with Gloss. Gist Link for convenience ...
Agnishom Chattopadhyay's user avatar
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4 votes
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I am learning Haskell and I implemented a recursive function that generates possible strings by length and array (e.g. ['a'..'z']): ...
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