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@frivolta
Created October 11, 2021 08:16
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const multiply20 = (price) => price * 20;
const divide100 = (price) => price / 100;
const normalizePrice = (price) => price.toFixed(2);
const addPrefix = (price) => "$" + String(price);
const pipe =
(...fns) =>
(x) =>
fns.reduce((res, fn) => fn(res), x);
const compose =
(...fns) =>
(x) =>
fns.reduceRight((res, fn) => fn(res), x);
const discountPipe = pipe(multiply20, divide100, normalizePrice, addPrefix);
const discountCompose = compose(
addPrefix,
normalizePrice,
divide100,
multiply20
);
discountPipe(200); // '$40.00'
discountCompose(200); // '$40.00'
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