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    class-extender

    1.0.11 • Public • Published

    Class extender

    This module is deprecated please use ES6 instead this module.

    Motivation

    As you know there is a lot of different class extenders. Maybe you ask yourself why another class extender. Answer is simple. This is not a new class extender :) It is based on Simple Javascript inheritance. You can use this library as AMD, CommonJS or root library in your Webpack or RequireJS module bundler. Works in the browser, in NodeJS, Bower and with Browserify.

    A couple things to note about this implementation:

    • Creating a constructor had to be simple (in this case simply providing an init method does the trick).
    • In order to create a new ‘class’ you must extend (sub-class) an existing class.
    • All of the ‘classes’ inherit from a single ancestor: Class. Therefore if you want to create a brand new class it must be a sub-class of Class.
    • And the most challenging one: Access to overridden methods had to be provided (with their context properly set). You can see this with the use of this._super(), above, calling the original init() and dance() methods of the Person super-class.

    Install

    NodeJS:

    $ npm install class-extender
    

    Bower:

    $ bower install class-extender
    

    Event emitter

    If your are looking for simple event emitter library you can use class-evented library

    Examples

    Use as CommonJS module:

    var Class = require('class-extender');
    
    var Person = Class.extend({
    	init: function(department) {
    		this._department = department;
    	},
    
    	getDepartment: function() {
    		return this.department;
    	}
    });
    
    var Admin = Person.extend({
    	init: function() {
    		this._super('IT');
    	},
    
    	getDepartment: function() {
    		return this._super() + ':)';
    	}
    });
    
    var person = new Person('secretary');
    person.getDepartment(); // => 'secretary'
    
    var admin = new Admin();
    admin.getDepartment(); // => 'IT:)'
    
    admin instanceof Admin; // => true
    admin instanceof Person; // => true
    admin instanceof Class; // => true
    

    Use as AMD module: person.js:

    define(['class-extender'], function(Class) {
    	return Class.extend({
    		init: function(department) {
    			this._department = department;
    		},
    
    		getDepartment: function() {
    			return this.department;
    		}
    	});
    });
    

    admin.js:

    define(['./person'], function(Person) {
    	return Person.extend({
    		init: function() {
    			this._super('IT');
    		},
    
    		getDepartment: function() {
    			return this._super() + ':)';
    		}
    	});
    });
    

    test.js

    define(['class-extender', './person', './admin'], function(Class, Person, Admin) {
    
    	var person = new Person('secretary');
    	person.getDepartment(); // => 'secretary'
    
    	var admin = new Admin();
    	admin.getDepartment(); // => 'IT:)'
    
    	admin instanceof Admin; // => true
    	admin instanceof Person; // => true
    	admin instanceof Class; // => true
    });
    

    Multiple inheritance

    Basically this functionality is not supported. But there is one option. You can copy own properties from existing classes. There is second parameter of function extend.

    Class.extend({
    	init: function(name) {
    		this._name = name;
    	}
    }, [Person, AnotherClass]);
    

    Credits

    Zlatko Fedor

    License

    The MIT License (MIT)

    Copyright (c) 2014 Zlatko Fedor zlatkofedor@cherrysro.com

    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.

    Install

    npm i class-extender

    DownloadsWeekly Downloads

    1

    Version

    1.0.11

    License

    none

    Last publish

    Collaborators

    • zlatkofedor