---
layout: page
title: "JavaScript array_merge function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/array_merge:326
- /functions/view/array_merge
- /functions/view/326
- /functions/array_merge:326
- /functions/326
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's array_merge

{% codeblock array/array_merge.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/array_merge.js raw on github %}
function array_merge () {
  // From: http://phpjs.org/functions
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // +   bugfixed by: Nate
  // +   input by: josh
  // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: arr1 = {"color": "red", 0: 2, 1: 4}
  // *     example 1: arr2 = {0: "a", 1: "b", "color": "green", "shape": "trapezoid", 2: 4}
  // *     example 1: array_merge(arr1, arr2)
  // *     returns 1: {"color": "green", 0: 2, 1: 4, 2: "a", 3: "b", "shape": "trapezoid", 4: 4}
  // *     example 2: arr1 = []
  // *     example 2: arr2 = {1: "data"}
  // *     example 2: array_merge(arr1, arr2)
  // *     returns 2: {0: "data"}
  var args = Array.prototype.slice.call(arguments),
    argl = args.length,
    arg,
    retObj = {},
    k = '',
    argil = 0,
    j = 0,
    i = 0,
    ct = 0,
    toStr = Object.prototype.toString,
    retArr = true;

  for (i = 0; i < argl; i++) {
    if (toStr.call(args[i]) !== '[object Array]') {
      retArr = false;
      break;
    }
  }

  if (retArr) {
    retArr = [];
    for (i = 0; i < argl; i++) {
      retArr = retArr.concat(args[i]);
    }
    return retArr;
  }

  for (i = 0, ct = 0; i < argl; i++) {
    arg = args[i];
    if (toStr.call(arg) === '[object Array]') {
      for (j = 0, argil = arg.length; j < argil; j++) {
        retObj[ct++] = arg[j];
      }
    }
    else {
      for (k in arg) {
        if (arg.hasOwnProperty(k)) {
          if (parseInt(k, 10) + '' === k) {
            retObj[ct++] = arg[k];
          }
          else {
            retObj[k] = arg[k];
          }
        }
      }
    }
  }
  return retObj;
}
{% endcodeblock %}

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

### Example 1
This code
{% codeblock lang:js example %}
arr1 = {"color": "red", 0: 2, 1: 4}
arr2 = {0: "a", 1: "b", "color": "green", "shape": "trapezoid", 2: 4}
array_merge(arr1, arr2)
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
{"color": "green", 0: 2, 1: 4, 2: "a", 3: "b", "shape": "trapezoid", 4: 4}
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
arr1 = []
arr2 = {1: "data"}
array_merge(arr1, arr2)
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
{0: "data"}
{% endcodeblock %}


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