---
layout: page
title: "JavaScript array_diff_key function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/array_diff_key:311
- /functions/view/array_diff_key
- /functions/view/311
- /functions/array_diff_key:311
- /functions/311
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's array_diff_key

{% codeblock array/array_diff_key.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/array_diff_key.js raw on github %}
function array_diff_key (arr1) {
  // From: http://phpjs.org/functions
  // +   original by: Ates Goral (http://magnetiq.com)
  // +    revised by: Brett Zamir (http://brett-zamir.me)
  // +    input by: Everlasto
  // *     example 1: array_diff_key({red: 1, green: 2, blue: 3, white: 4}, {red: 5});
  // *     returns 1: {"green":2, "blue":3, "white":4}
  // *     example 2: array_diff_key({red: 1, green: 2, blue: 3, white: 4}, {red: 5}, {red: 5});
  // *     returns 2: {"green":2, "blue":3, "white":4}
  var argl = arguments.length,
    retArr = {},
    k1 = '',
    i = 1,
    k = '',
    arr = {};

  arr1keys: for (k1 in arr1) {
    for (i = 1; i < argl; i++) {
      arr = arguments[i];
      for (k in arr) {
        if (k === k1) {
          // 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_key.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_key.js)

### Example 1
This code
{% codeblock lang:js example %}
array_diff_key({red: 1, green: 2, blue: 3, white: 4}, {red: 5});
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
{"green":2, "blue":3, "white":4}
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
array_diff_key({red: 1, green: 2, blue: 3, white: 4}, {red: 5}, {red: 5});
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
{"green":2, "blue":3, "white":4}
{% endcodeblock %}


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