Compose functions
JavaScript, Function · Oct 22, 2020
Performs right-to-left function composition.
- Use
Array.prototype.reduce()to perform right-to-left function composition. - The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.
const compose = (...fns) =>
fns.reduce((f, g) => (...args) => f(g(...args)));const add5 = x => x + 5;
const multiply = (x, y) => x * y;
const multiplyAndAdd5 = compose(
add5,
multiply
);
multiplyAndAdd5(5, 2); // 15
