30-seconds-of-code/snippets/pipe-functions.md

Pipe functions

Use Array.reduce() with the spread operator (...) to perform left-to-right function composition. The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.

const pipe = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));
/*
const add5 = x => x + 5
const multiply = (x, y) => x * y
const multiplyAndAdd5 = pipe(multiply, add5)
multiplyAndAdd5(5, 2) -> 15
*/