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

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Pipe functions	function	goat-wooden-cottage	2017-12-26T19:02:27+02:00	2020-10-22T20:24:04+03:00

Performs left-to-right function composition.

• Use Array.prototype.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 pipeFunctions = (...fns) =>
  fns.reduce((f, g) => (...args) => g(f(...args)));

const add5 = x => x + 5;
const multiply = (x, y) => x * y;
const multiplyAndAdd5 = pipeFunctions(multiply, add5);
multiplyAndAdd5(5, 2); // 15