stdclass

A dead simple JavaScript inheritance implementation. A tool, not a framework.

StdClassJS

A dead simple JavaScript inheritance implementation.

Install With NPM

$ npm install stdclass

Unit Testing (optional)

$ npm install --dev stdclass
$ npm test stdclass

Require It

#!/usr/bin/env node
var StdClass = require( 'stdclass' );
<script src="/path/to/stdclass.js"></script>

Feel free to copy the source between /* BEGIN CLASS: StdClass */ and /* END CLASS: StdClass */ into your own project. Remember to include the license.

StdClass has three static methods that do all the magic.

  • extend
    • Takes an optional constructor function as an argument.
    • If no argument is given, then the parent constructor will be inherited.
    • Creates a child class that inherits from the constructor that extend is being statically called on.
    • Calls mixin to add extend and extendProto static methods to the new child class.
    • Returns the constructor.
  • extendProto
    • Takes 0 or more objects as arguments.
      • Passing no objects is silly, but allowed.
    • All non-null/non-undefined properties on all objects passed to extendProto will be added to the class constructor prototype.
    • Returns the constructor.
  • mixin
    • Takes a required constructor function argument.
    • Attaches the extend and extendProto static methods which can then be used to extend the class.
    • Useful for adding StdClass inheritance to classes that cannot directly inherit from StdClass.
    • Returns the constructor.

The mixin method is not copied by either mixin or extend; however, it can be manually copied should you want to extend the functionality of StdClass itself.

// Parent class
var MyParent = StdClass.extend( function( args, go, here )
{
    // Do parent constructor stuff
})
.extendProto({
    instanceMethod: function( and, here )
    {
        // Do method stuff
    }
});

// Child class
var MyChild = MyParent.extend( function( args, go, here, too )
{
    // Call the parent constructor
    MyParent.call( this, args, go, here );

    // Do child constructor stuff
    this.too = too;
})
.extendProto({
    instanceMethod: function( and, here, too )
    {
        // Call the parent method
        MyParent.prototype.instanceMethod.call( this, and, here );

        // Do child method stuff
        this.too = too;
    },
    newMethod: function()
    {
        // Do new method stuff
    }
});

// No explicit constructor means inherit the parent constructor.
var InheritedConstructor = MyChild.extend();

// extendProto with multiple arguments
InheritedConstructor.extendProto(
    {
        foo: 'foo', // Replaced below
        bar: 'bar', // Not replaced below
    },
    {
        foo: 'foo2', // Replaces above 'foo' value
        bar: null // Does not replace above 'bar' value
    }
)

var DumbClass = function()
{
    // Assume this is somebody elses class that you've included in your
    // project. It doesn't have any built in way of extending it! You'll
    // have to do it the old fashioned way... or will you?
};

StdClass.mixin( DumbClass );

// Woot!
var NotSoDumbClass = DumbClass.extend();

The MIT License (MIT)

Copyright (c) 2013 Christopher Ackerman

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.