JS utility functions

pipe.js

/**
 * Example:
 *
 * const multiply20 = (price) => price * 20;
 * const divide100 = (price) => price / 100;
 * const normalizePrice = (price) => price.toFixed(2);
 * const addPrefix = (price) => '$' + String(price);
 * 
 * const getDiscount = pipe(multiply20, divide100, normalizePrice, addPrefix);
 * 
 * getDiscount(200); // '$40.00'
 */

const pipe =
  (...functions) =>
  (value) => functions.reduce((result, nextFn) => nextFn(result), value);

module.exports = pipe;