---
layout: page
title: "JavaScript array_diff function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/array_diff:309
- /functions/view/array_diff
- /functions/view/309
- /functions/array_diff:309
- /functions/309
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's array_diff

{% codeblock array/array_diff.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/array_diff.js raw on github %}
function array_diff (arr1) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Sanjoy Roy
  // +    revised by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: array_diff(['Kevin', 'van', 'Zonneveld'], ['van', 'Zonneveld']);
  // *     returns 1: {0:'Kevin'}
  var retArr = {},
    argl = arguments.length,
    k1 = '',
    i = 1,
    k = '',
    arr = {};

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

### Example 1
This code
{% codeblock lang:js example %}
array_diff(['Kevin', 'van', 'Zonneveld'], ['van', 'Zonneveld']);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
{0:'Kevin'}
{% endcodeblock %}


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