phpjs/_octopress/source/functions/array_diff_ukey/index.markdown

php.js offers community built php functions in javascript

---
layout: page
title: "JavaScript array_diff_ukey function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/array_diff_ukey:313
- /functions/view/array_diff_ukey
- /functions/view/313
- /functions/array_diff_ukey:313
- /functions/313
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's array_diff_ukey

{% codeblock array/array_diff_ukey.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/array_diff_ukey.js raw on github %}
function array_diff_ukey (arr1) {
  // From: http://phpjs.org/functions
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: $array1 = {blue: 1, red: 2, green: 3, purple: 4}
  // *     example 1: $array2 = {green: 5, blue: 6, yellow: 7, cyan: 8}
  // *     example 1: array_diff_ukey($array1, $array2, function (key1, key2){ return (key1 == key2 ? 0 : (key1 > key2 ? 1 : -1)); });
  // *     returns 1: {red: 2, purple: 4}
  var retArr = {},
    arglm1 = arguments.length - 1,
    cb = arguments[arglm1],
    arr = {},
    i = 1,
    k1 = '',
    k = '';

  cb = (typeof cb === 'string') ? this.window[cb] : (Object.prototype.toString.call(cb) === '[object Array]') ? this.window[cb[0]][cb[1]] : cb;

  arr1keys: for (k1 in arr1) {
    for (i = 1; i < arglm1; i++) {
      arr = arguments[i];
      for (k in arr) {
        if (cb(k, k1) === 0) {
          // If it reaches here, it was found in at least one array, so try next value
          continue arr1keys;
        }
      }
      retArr[k1] = arr1[k1];
    }
  }

  return retArr;
}
{% endcodeblock %}

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

### Example 1
This code
{% codeblock lang:js example %}
$array1 = {blue: 1, red: 2, green: 3, purple: 4}
$array2 = {green: 5, blue: 6, yellow: 7, cyan: 8}
array_diff_ukey($array1, $array2, function (key1, key2){ return (key1 == key2 ? 0 : (key1 > key2 ? 1 : -1)); });
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
{red: 2, purple: 4}
{% endcodeblock %}


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