Pipe functions

JavaScript, Function · Oct 22, 2020

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

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