Category "functional-programming"

Why does partial application work when currying but not with .bind()?

I'm practicing partial application of a function, that is, fixing function arguments. I've learned two ways to achieve it: By currying the original function fir

Getting the index of the first occurrence of a given element in a given list

I am trying to implement the following specification: busca.v.xs = <Min i : 0 ≤ i < #xs ∧ xs.i = v : i> I wrote something like the following. b

Amstrong number using lambda Expressions in Java 8

I am fairly new to functional programming. Following is my code to check the sum of powered digits(Arsmstrong number check). Number is an input for example: 370

Why isn't (20 >) . length . take 10 === const True

tl;dr Isn't the fact that 20 < length $ take 10 $ whatever requires whatever to successfully pattern patch a list (at least either [] or (_:_)) a "lack" of l

rambda is missing sortWith

I really like rambda (vs ramda), however I faced the function sortWith is missing and that is even not mentioned in spec. Is there any way to get a similar func

Creating an immutable object as a class in javascript

I would like to create an object that has various methods, but the core data can never be changed. If using a class-based approach, are using private variables

In groovy, how can i iterate over a csv file and call a function for every "group" that as a different value on some of the columns?

In Groovy and running on a jenkins pipeline, I am using the readFile function from jenkins to read the csv file. Example csv: name val1 val2 John 2 122 John 2

Dealing With Assertions in Functional Code

While doing functional programming I often end up in situations where I know something that the type system of the language does not know. Consider the followin

HOC with functional component

I'm trying to make a simple HOC (Higher Order Function) with a functional component IN React.js. I have done the following, and it's compile, but nothing is sho

Improve debugging output of a recursive function

I have the following recursive function to count the number of ways change can be returned given various coin denominations: function makeChange(amount, coi

Improve debugging output of a recursive function

I have the following recursive function to count the number of ways change can be returned given various coin denominations: function makeChange(amount, coi

How to access a function defined as key of an object from within another function defined as key of same object in JS

Given below code, I need to reuse functionality from innerFunc1 and innerFunc2 in innerfunc3, but I am not sure, how innerFunc1 and innerFunc2 can be accessed i

Is there a more functional way to merge and foreach/sort two arrays in TypeScript, React?

I'm learning React and TypeScript. For sake of practise, I've tried to create a calculator design by merging two arrays to map a single array onto the grid (dis

Type inference in ZIO giving Any in for comprehension

So I have written a method to count the number of lines in a file in ZIO. def lines(file: String): Task[Long] = { def countLines(reader: BufferedReader): Ta

Count and print unique list items in one chain using Java Streams

I'm trying to achieve this using only functional programming constructs (Streams, Collectors, lambda expressions). Let's say list is a String[]: {"Apple", "Sa

Python - applying tupple to a function in functional toolz.pipe

I want to use a function which accepts some arguments in a toolz.pipe, but data input is a tuple. I know how to solve it, but I think there must be some solutio

Python fuctional style iterative algoritm?

In Haskell there is a simple list function available iterate :: (a -> a) -> a -> [a] iterate f x = x : iterate f (f x) In python it could be implemen

How to pre-fill arguments to a function in Ruby?

Let's say I have a function foo: def foo(A, B, C) A + B + C end And I call it like this, with only the last parameter changing: foo("foo", "bar", "123") foo("

How would a functional language actually define/translate primitives to hardware?

Let's say I have a few primitives defined, here using javascript: const TRUE = x => y => x; const FALSE = x => y => y; const ZERO = f => a =>

Why use Arrow's Options instead of Kotlin nullable

I was having a look at the Arrow library found here. Why would ever want to use an Option type instead of Kotlin's built in nullables?

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