locutus/php/array/usort.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

'use strict';

module.exports = function usort(inputArr, sorter) {
  //  discuss at: https://locutus.io/php/usort/
  // original by: Brett Zamir (https://brett-zamir.me)
  // improved by: Brett Zamir (https://brett-zamir.me)
  //      note 1: This function deviates from PHP in returning a copy of the array instead
  //      note 1: of acting by reference and returning true; this was necessary because
  //      note 1: IE does not allow deleting and re-adding of properties without caching
  //      note 1: of property position; you can set the ini of "locutus.sortByReference" to true to
  //      note 1: get the PHP behavior, but use this only if you are in an environment
  //      note 1: such as Firefox extensions where for-in iteration order is fixed and true
  //      note 1: property deletion is supported. Note that we intend to implement the PHP
  //      note 1: behavior by default if IE ever does allow it; only gives shallow copy since
  //      note 1: is by reference in PHP anyways
  //   example 1: var $stuff = {d: '3', a: '1', b: '11', c: '4'}
  //   example 1: usort($stuff, function (a, b) { return (a - b) })
  //   example 1: var $result = $stuff
  //   returns 1: {0: '1', 1: '3', 2: '4', 3: '11'}

  var valArr = [];
  var k = '';
  var i = 0;
  var sortByReference = false;
  var populateArr = {};

  if (typeof sorter === 'string') {
    sorter = this[sorter];
  } else if (Object.prototype.toString.call(sorter) === '[object Array]') {
    sorter = this[sorter[0]][sorter[1]];
  }

  var iniVal = (typeof require !== 'undefined' ? require('../info/ini_get')('locutus.sortByReference') : undefined) || 'on';
  sortByReference = iniVal === 'on';
  populateArr = sortByReference ? inputArr : populateArr;

  for (k in inputArr) {
    // Get key and value arrays
    if (inputArr.hasOwnProperty(k)) {
      valArr.push(inputArr[k]);
      if (sortByReference) {
        delete inputArr[k];
      }
    }
  }
  try {
    valArr.sort(sorter);
  } catch (e) {
    return false;
  }
  for (i = 0; i < valArr.length; i++) {
    // Repopulate the old array
    populateArr[i] = valArr[i];
  }

  return sortByReference || populateArr;
};
//# sourceMappingURL=usort.js.map