fusion.js

const add1 = (v) => v + 1;
const mul2 = (v) => v * 2;
const div3 = (v) => v / 3;

const compose = (fn1, fn2) => (...args) => fn1(fn2(...args));
const mapper = [div3, mul2, add1].reduce(compose);

const result = [2, 5, 8, 11, 14, 17, 20].map(mapper);
console.log(result);