1-liners/partition.js

Useful oneliners and shorthand functions

/**
 * @module 1-liners/partition
 *
 * @description
 *
 * Creates an array of elements split into two groups, the first of which contains elements `predicate` returns truthy for,
 * the second of which contains elements `predicate` returns falsey for. The predicate is invoked with one argument: `(value)`.
 *
 * @example
 *
 * const partition = require('1-liners/partition');
 *
 * const [even, odd] = partition([1, 2, 3, 4], n => n % 2 === 0); // => even: [2, 4], odd: [1, 3]
 */
"use strict";

exports.__esModule = true;

exports["default"] = function (array, predicate) {
  return array.reduce(function (result, item) {
    return result[Number(!predicate(item))].push(item), result;
  }, [[], []]);
};

module.exports = exports["default"];