JavaScript
CHALLENGE
const compose = (...fns) => x => fns.reduceRight((acc, fn) => fn(acc), x);
const pipe = (...fns) => x => fns.reduce((acc, fn) => fn(acc), x);
const addOne = x => x + 1;
const double = x => x * 2;
const square = x => x * x;
console.log(compose(square, double, addOne)(3), pipe(square, double, addOne)(3));
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