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

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