phpjs/_octopress/source/functions/runkit_class_adopt/index.markdown

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---
layout: page
title: "JavaScript runkit_class_adopt function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/runkit_class_adopt:820
- /functions/view/runkit_class_adopt
- /functions/view/820
- /functions/runkit_class_adopt:820
- /functions/820
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's runkit_class_adopt

{% codeblock runkit/runkit_class_adopt.js lang:js https://raw.github.com/kvz/phpjs/master/functions/runkit/runkit_class_adopt.js raw on github %}
function runkit_class_adopt (classname, parentname) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // %          note 1: Function can only obtain and set classes from the global context
  // *     example 1: function A () {}
  // *     example 1: A.prototype.methodA = function () {};
  // *     example 1: function B () {}
  // *     example 1: runkit_class_adopt('B', 'A');
  // *     returns 1: true

  if (typeof this.window[classname] !== 'function' || typeof this.window[parentname] !== 'function') {
    return false;
  }

  // Classical style of inheritance
  this.window[classname].prototype = new this.window[parentname](); // Has side effects by calling the constructor!

/*
  // Prototypal completely by reference
  this.window[classname].prototype = parentname.prototype; // By mutual reference!
*/

/*
  // Mixin (deep copy, not by reference)
  var _copy = function (child, parent) {
    var p = '';
    for (p in parent) {
      if (typeof parent[p] === 'object') {
        child[p] = _copy(child[p], parent[p]);
      }
      else {
        child[p] = parent[p];
      }
    }
  };
  _copy(this.window[classname].prototype, this.window[parentname].prototype);
*/

  // Put original constructor property back
  this.window[classname].constructor = this.window[classname];
  return true;
}
{% endcodeblock %}

 - [view on github](https://github.com/kvz/phpjs/blob/master/functions/runkit/runkit_class_adopt.js)
 - [edit on github](https://github.com/kvz/phpjs/edit/master/functions/runkit/runkit_class_adopt.js)

### Example 1
This code
{% codeblock lang:js example %}
function A () {}
A.prototype.methodA = function () {};
function B () {}
runkit_class_adopt('B', 'A');
{% endcodeblock %}

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


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