compose.js

// Compose functions from right to left
const compose = (...fns) => x => fns.reduceRight((y, f) => f(y), x);

// Example
const lowercase = str => str.toLowerCase();
const capitalize = str => `${str.charAt(0).toUpperCase()}${str.slice(1)}`;
const reverse = str => str.split('').reverse().join('');

const fn = compose(reverse, capitalize, lowercase);

// We will execute `lowercase`, `capitalize` and `reverse` in order
fn('Hello World') === 'dlrow olleH';