All Questions
Tagged with functional or functional-programming
1,015 questions
3
votes
2
answers
101
views
Base16/32/64 implementation for C++ ranges
Introduction
The following code is an implementation of, in ambition, RFC 4648 compliant Base16, Base32 and Base64 conversions as range adaptors and constrained algorithms in C++23. It can be used at ...
- 791
2
votes
0
answers
60
views
std::ranges compile time (and run time) RFC 4648 compliant Base16 conversions in C++23 (improved 2)
This increment
This obsoletes a former version, after taking a great review into account:
The encoding now preserves sized_range and ...
- 791
2
votes
1
answer
150
views
Compile time (and run time) RFC 4648 compliant Base16 conversions as range adaptors in C++23 (improved) [duplicate]
Edit: obsoleted by an improved version.
Edit: now updated with unit tests that show that this implementation also works for non-forward ranges, i.e. string streams, files streams, on-the-fly encoding/...
- 791
3
votes
2
answers
314
views
Compile time (and run time) RFC 4648 compliant Base16 conversions as range adaptors in C++23
This obsoletes a former version and is obsoleted by an improved version.
The following code is an implementation of, in ambition, RFC 4648 compliant Base16 conversions as range adaptors in C++23. It ...
- 791
4
votes
1
answer
201
views
Hexadecimal conversions as range adaptors in C++23 that work at compile time (and run time) [duplicate]
This is obsoleted by a significantly better version.
The following code is an implementation of hexadecimal conversions as range adaptors in C++23. It can be used at compile time, but should of course ...
- 791
5
votes
3
answers
190
views
HackerRank, Haskell simple "compression" algorithm
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 ...
- 770
4
votes
6
answers
416
views
Search values by priority in a Stream
I have a simple list of results, and I need to return only one value depending on content, for example:
...
- 149
3
votes
1
answer
395
views
Event sourcing javascript implementation
An event source built around an observer design pattern implementation…
...
user284150
1
vote
1
answer
66
views
Buffered source of HTMLElement(s)
Temporary storing the element(s) returned by document.querySelector and document.querySelectorAll methods could improve ...
user284064
8
votes
1
answer
99
views
Haskell 2-player TicTacToe terminal game
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 ...
- 183
8
votes
3
answers
2k
views
fmap for containers in c++
I implemented a simple fmap for containers. However containers don't have a unified function to add elements. So I wrote different concepts for different containers. Is there a better way to implement ...
- 83
3
votes
1
answer
100
views
In Java, replace for loop with condition with lambdas [closed]
I want to replace a for loop with a break/return condition inside with a lambda.
I think I have a good replacement, but I want ...
1
vote
1
answer
81
views
Sprinkler effect
Developed around visibility CSS property and HTMLElement#offsetHeight and ...
user283117
4
votes
3
answers
197
views
Get the contents of a table cell for all selected rows
I have a table of user info. When you click the button, I want to get the email address from each selected row, output into a comma-separated string.
I got it to work with the following code, but I'm ...
- 143
7
votes
2
answers
207
views
Function composition in the context of data processing pipelines
Prior Notification
This follows a previous review of mine that addressed the core helper function named make_skippable.
The composition implementation presented ...
- 115
3
votes
2
answers
132
views
Extending callable signature with std::optional in context of function composition (make_skippable)
(Please note: the post about the compose implementation announced below is now available.)
This is about decorating callables by making their argument and return value to be a ...
- 115
2
votes
2
answers
173
views
Map coloring algorithm functional implementation in python
I'm an autodidact working on map coloring algorithms with backtracking, see chapter 2 of this book.
I tested this implementation with success but I'm still unsure whether it is tricking me somewhere, ...
- 23
5
votes
1
answer
123
views
Locate and multiply numbers in a 2D grid (Advent of Code 2023 Day 3, Part 2)
I am using the Advent of Code 2023 to study functional programming and the ranges library in C++. This code is for the second part of Day 3 and is the best solution using FB I've created. I'd ...
- 185
3
votes
1
answer
105
views
Is it valid to pass struct through std::fold_left to persist state?
I am exploring functional programming design with C++. The code below uses a struct passed to ranges::fold_left for processing. The final result is returned in the ...
- 185
2
votes
1
answer
104
views
Move timestamp to the next Monday 10:01 AM [closed]
I've been battling ChatGPT for hours now and can't get satisfied with this simple algorithm in TypeScript. These two (hopefully correct) TypeScript+ReactNative solutions should move the timestamp ...
- 121
5
votes
2
answers
156
views
Print the three most occurring chars in Java using streams
The three characters that occurs most in a given string should be printed by using streams/lambdas (functional programming). The order of characters that occur equally often should be preserved.
My ...
- 628
3
votes
1
answer
97
views
Sequentially find the indexes of an element into a collection
Util class to find into a collection the indexes of a given element with multiple occurrences from the first index or relative to a given index.
...
user277679
4
votes
4
answers
1k
views
Merging sorted integer arrays (without duplicates)
I have written a Python function called merge_arrays which takes two lists and returns the new list merge without duplicate.
The function works as expected, but my ...
- 553
1
vote
1
answer
117
views
Simple Curry function
This is a interview practice question from BFE.dev.
Currying is a useful technique used in JavaScript applications.
Please implement a curry() function, which ...
1
vote
2
answers
59
views
Imrove performance when updating DataFrame rows based on complex criteria
My question got rejected the last time so I am trying a better approach to getting a solution:
...
- 21
5
votes
1
answer
137
views
Partial Function Application in JavaScript
I'm trying to make a partial function from any function.
Here is a working example:
...
- 269
1
vote
1
answer
57
views
Click temporization on user interface elements
Implementation to accommodate different behaviours based on the frequency a user interface element is clicked. It supports number of clicks and number of clicks in a time frame.
...
- 11
2
votes
1
answer
129
views
3
votes
1
answer
75
views
Dyalog APL dyadic operator deriving ambivalent function to pair two function results
I'm writing a small utility operator which applies two functions to an argument pair and strands the results. The pair can either be given as two arguments or as a single argument with two elements. ...
- 656
1
vote
2
answers
602
views
Removing Elements from an Array Based on a Second Array
I've written a function that takes two arrays of integers as input and removes all the elements in the first array that are also present in the second array. I would like to share my code with you and ...
- 553
1
vote
1
answer
55
views
Optimizing the Dig Pow function
I have written a Python function to solve the Dig Pow problem, where the goal is to find a number k such that the sum of each digit of n raised to a specific and ...
- 553
7
votes
5
answers
1k
views
Optimizing a function to find the closest multiple of 10
I have written a Python function called closest_multiple_10() which takes an integer as input and returns the closest multiple of 10. The function works as expected,...
- 553
2
votes
1
answer
93
views
Binary tree zipper with basic operations
I am looking for a review of my Binary Tree Zipper implementation on Ocaml.
These are the defined operations:
get (gets the substructure, or the trees after the focus element)
bempty creates an empty ...
- 535
0
votes
1
answer
41
views
Creating functions in a hierarchy where they get the same arguments
When I write code, I tend to follow functional paradigms often. The main thing I try to do is use values returned from functions.
What I notice though, is I end up having a sort of function argument ...
- 119
2
votes
1
answer
66
views
Lazy evaluation vs strict one applied to fib
I have this OCaml problem:
Recall the polymorphic type lazy seen in class, the function delay which transforms a ...
- 535
5
votes
1
answer
916
views
Monad object in C++
Have I defined a Monad object for C++? Below is a class called var which I created years ago to implement a lambda calculus like interpreter in C++. The class ...
- 369
4
votes
7
answers
266
views
Breaking a string expression in operator and operands
Requesting for a code review for a scala implementation.
Problem
Given an expression string made of numbers and operators +,-,/,* , break it in a list of Integer or ...
- 385
4
votes
2
answers
190
views
Abundant number implementation
I have implementted a simple JavaScript function to find the list of abundant numbers and print them on the screen.
an abundant number is a number for which the sum of its proper divisors is greater ...
1
vote
1
answer
134
views
Transform an array into object and set index for an unique key in javascript
I have a method that merges keys and indexes from an array into an object.
I'm stuck with ways to compress this method, and I don't know what I can do to make it simpler.
Goal
get an array of objects ...
- 155
3
votes
0
answers
72
views
A Haskell-style "maybe" type in Python, version 2
I have decided on a preferred solution to my question A maybe type in Python. Which implementation is best?, and have expanded it to be more ergonomic. I have implemented a host of utility functions (...
- 499
1
vote
1
answer
47
views
Reactjs Component Reusability
I am working on a project in react. Where most of the data on different tabs have a table. So I design the "TableItems" component and passed the data according to the component. Right now ...
- 11
-2
votes
1
answer
1k
views
Create a function with two parameters: a list and a string, where the string has the following values [closed]
I tried so many things to do this task. I have no idea why doesn't it work. Please help!
...
- 1
1
vote
1
answer
79
views
Meta Collatz Sequence
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....
- 818
1
vote
2
answers
204
views
Simplify a function which performs manipulation of data in Javascript
Upon suggestion in the original question within Stack Overflow, I'm bringing my question here.
We have created a function that will convert the data into the desired format, but it has a lot of code ...
- 113
1
vote
1
answer
57
views
2
votes
1
answer
128
views
Project Euler 11 Haskell - Largest product in a grid
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 ...
- 123
3
votes
2
answers
735
views
MP3 Playlist Class in Python
Background Info
I am an intermediate level Python programmer. This is my implementation of a MP3 Playlist class challenge that was hosted on 101 Computing.Net. The ...
- 191
2
votes
1
answer
196
views
Commented Parser Combinators in Lisp-style C
I've attempted to remedy the issues outlined in the answer to my previous question. I've added several hundred blank lines to better illustrate the grouping of functions and generally make things look ...
- 2,038
2
votes
1
answer
149
views
Parser Combinators in C redux
A few more rewrites down the line from my previous question, this is the C version 11 based on the PostScript prototype version 12. The PostScript version is shorter, but it's some crazy ass ...
- 2,038
1
vote
2
answers
88
views
UPDATE on Newspaper Bill Calculator CLI with Python (1 of 3, Core)
Code is posted after explanation.
Due to the size of the project, this is being posted in three separate posts. This also ensures each post is more focused.
Post 2 of 3, CLI: UPDATE 1 on Newspaper ...
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