---
layout: page
title: "JavaScript array_pad function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/array_pad:328
- /functions/view/array_pad
- /functions/view/328
- /functions/array_pad:328
- /functions/328
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's array_pad

{% codeblock array/array_pad.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/array_pad.js raw on github %}
function array_pad (input, pad_size, pad_value) {
  // From: http://phpjs.org/functions
  // +   original by: Waldo Malqui Silva
  // *     example 1: array_pad([ 7, 8, 9 ], 2, 'a');
  // *     returns 1: [ 7, 8, 9]
  // *     example 2: array_pad([ 7, 8, 9 ], 5, 'a');
  // *     returns 2: [ 7, 8, 9, 'a', 'a']
  // *     example 3: array_pad([ 7, 8, 9 ], 5, 2);
  // *     returns 3: [ 7, 8, 9, 2, 2]
  // *     example 4: array_pad([ 7, 8, 9 ], -5, 'a');
  // *     returns 4: [ 'a', 'a', 7, 8, 9 ]
  var pad = [],
    newArray = [],
    newLength,
    diff = 0,
    i = 0;

  if (Object.prototype.toString.call(input) === '[object Array]' && !isNaN(pad_size)) {
    newLength = ((pad_size < 0) ? (pad_size * -1) : pad_size);
    diff = newLength - input.length;

    if (diff > 0) {
      for (i = 0; i < diff; i++) {
        newArray[i] = pad_value;
      }
      pad = ((pad_size < 0) ? newArray.concat(input) : input.concat(newArray));
    } else {
      pad = input;
    }
  }

  return pad;
}
{% endcodeblock %}

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

### Example 1
This code
{% codeblock lang:js example %}
array_pad([ 7, 8, 9 ], 2, 'a');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
[ 7, 8, 9]
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
array_pad([ 7, 8, 9 ], 5, 'a');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
[ 7, 8, 9, 'a', 'a']
{% endcodeblock %}

### Example 3
This code
{% codeblock lang:js example %}
array_pad([ 7, 8, 9 ], 5, 2);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
[ 7, 8, 9, 2, 2]
{% endcodeblock %}


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