const compose = (...fns) => (x) => fns.reduceRight((acc, fn) => fn(acc), x);
const pipe = (...fns) => (x) => fns.reduce((acc, fn) => fn(acc), x);
const double = (x) => x * 2;
const addTen = (x) => x + 10;
const square = (x) => x ** 2;
const negate = (x) => -x;
const transform1 = compose(negate, square, addTen, double);
const transform2 = pipe(double, addTen, square, negate);
const memoize = (fn) => {
const cache = new Map();
return (x) => {
if (!cache.has(x)) cache.set(x, fn(x));
return cache.get(x);
};
};
const memoTransform1 = memoize(transform1);
console.log(transform1(3));
console.log(transform2(3));
console.log(memoTransform1(3) === transform1(3));
Post #3203
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