pipeFunctions javascript Code Snippet in 2025

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