---
layout: page
title: "JavaScript usort function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/usort:575
- /functions/view/usort
- /functions/view/575
- /functions/usort:575
- /functions/575
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's usort

{% codeblock array/usort.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/usort.js raw on github %}
function usort (inputArr, sorter) {
  // From: http://phpjs.org/functions
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // +   improved by: Brett Zamir (http://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 "phpjs.strictForIn" 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: stuff = {d: '3', a: '1', b: '11', c: '4'};
  // *     example 1: stuff = usort(stuff, function (a, b) {return(a-b);});
  // *     example 1: stuff;
  // *     returns 1: {0: '1', 1: '3', 2: '4', 3: '11'};
  var valArr = [],
    k = '',
    i = 0,
    strictForIn = false,
    populateArr = {};

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

  // BEGIN REDUNDANT
  this.php_js = this.php_js || {};
  this.php_js.ini = this.php_js.ini || {};
  // END REDUNDANT
  strictForIn = this.php_js.ini['phpjs.strictForIn'] && this.php_js.ini['phpjs.strictForIn'].local_value && this.php_js.ini['phpjs.strictForIn'].local_value !== 'off';
  populateArr = strictForIn ? inputArr : populateArr;


  for (k in inputArr) { // Get key and value arrays
    if (inputArr.hasOwnProperty(k)) {
      valArr.push(inputArr[k]);
      if (strictForIn) {
        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 strictForIn || populateArr;
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/array/usort.js)

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are 
the closest match to this hashtable-like data structure. 

Please also note that php.js offers community built functions and goes by the 
[McDonald's Theory](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/array/usort.js)

### Example 1
This code
{% codeblock lang:js example %}
stuff = {d: '3', a: '1', b: '11', c: '4'};
stuff = usort(stuff, function (a, b) {return(a-b);});
stuff;
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
{0: '1', 1: '3', 2: '4', 3: '11'};
{% endcodeblock %}


### Other PHP functions in the array extension
{% render_partial _includes/custom/array.html %}