---
layout: page
title: "JavaScript array_pop function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/array_pop:329
- /functions/view/array_pop
- /functions/view/329
- /functions/array_pop:329
- /functions/329
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's array_pop

{% codeblock array/array_pop.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/array_pop.js raw on github %}
function array_pop (inputArr) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +      input by: Brett Zamir (http://brett-zamir.me)
  // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
  // +   input by: Theriault
  // %        note 1: While IE (and other browsers) support iterating an object's
  // %        note 1: own properties in order, if one attempts to add back properties
  // %        note 1: in IE, they may end up in their former position due to their position
  // %        note 1: being retained. So use of this function with "associative arrays"
  // %        note 1: (objects) may lead to unexpected behavior in an IE environment if
  // %        note 1: you add back properties with the same keys that you removed
  // *     example 1: array_pop([0,1,2]);
  // *     returns 1: 2
  // *     example 2: data = {firstName: 'Kevin', surName: 'van Zonneveld'};
  // *     example 2: lastElem = array_pop(data);
  // *     returns 2: 'van Zonneveld'
  // *     results 2: data == {firstName: 'Kevin'}
  var key = '',
    lastKey = '';

  if (inputArr.hasOwnProperty('length')) {
    // Indexed
    if (!inputArr.length) {
      // Done popping, are we?
      return null;
    }
    return inputArr.pop();
  } else {
    // Associative
    for (key in inputArr) {
      if (inputArr.hasOwnProperty(key)) {
        lastKey = key;
      }
    }
    if (lastKey) {
      var tmp = inputArr[lastKey];
      delete(inputArr[lastKey]);
      return tmp;
    } else {
      return null;
    }
  }
}
{% endcodeblock %}

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

### Example 1
This code
{% codeblock lang:js example %}
array_pop([0,1,2]);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
2
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
data = {firstName: 'Kevin', surName: 'van Zonneveld'};
lastElem = array_pop(data);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'van Zonneveld'
{% endcodeblock %}


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