Reverse compose functions
JavaScript, Function · Oct 22, 2020
Performs left-to-right function composition.
- Use
Array.prototype.reduce()to perform left-to-right function composition. - The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.
const composeRight = (...fns) =>
fns.reduce((f, g) => (...args) => g(f(...args)));const add = (x, y) => x + y;
const square = x => x * x;
const addAndSquare = composeRight(add, square);
addAndSquare(1, 2); // 9
