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This is a list of my solutions for Functional Programming Challenge in hackerrank and solved with OCaml.

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# ini membutuhkan direnv
# maka install juga direnv
# agar .envrc dapat dijalankan

# isi dari .envrc adalah
use nix

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window:
  dimensions:
    columns: 0
    lines: 0
  padding:
    x: 0
    y: 0

  dynamic_padding: false

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use flake

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// we write Maybe module (stolen from haskell)
module Maybe = {
  type t<'a> =
    | Just('a)
    | Nothing

  let fmap = (x, fn) =>
    switch x {
    | Just(x) => Just(x->fn)
    | Nothing => Nothing

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Common Tools for development in Mac

xcode-select

• version

xcode-select --version
// xcode-select version 2392.

• Install

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const add = (a, b) => a + b
const adds = (...n) => n.reduce(add)

const mul = (a, b) => a * b
const muls = (...n) => n.reduce(mul)

const div = (a, b) => a / b
const divs = (...n) => n.reduce(div)

const mod = (a, b) => a % b

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/**
  * @param {Number} n
  * @return {Number} 
  * @example
  *
  * reverseNumber(123)       // 321
  * reverseNumber(212)       // 212 
  * reverseNumber(123456789) // 987654321
  */
const reverseNumber = (input) => {

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use nix

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// HEY TAYO HEY TAYO DIA SI FUNGSI NAKAL MELAJU MENGHAJAR
// basic operation {a + b} {a - b} as function
let add = (a, b) => a + b;
let sub = (a, b) => a - b;
// function for add one {a + 1}
let addOne = (b) => add(1, b);
// function for reverse value by length that defined as {a}
// and solve with Math
let reverse = (a, b) => addOne(sub(a, b));
// function for know the maximum value of numbers