Oopify

Class implementation with protected, multiple inheritance, getters/setters and mixins.

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Install

Install via NPM

npm install oopify

Install via Bower

bower install oopify

Or install manually.

Get started

Browsers

Select standalone or separate method:

standalone (build-in WeakMap Shim)

Include on page complete build of oopify.all.min.js:

<script src="/node_modules/oopify/dist/oopify.all.min.js"></script>

separate (without WeakMap Shim)

Include on page WeakMap Shim (if you want support old browsers) and oopify.min.js:

<script src="/node_modules/weakmap/weakmap.min.js"></script>
<script src="/node_modules/oopify/dist/oopify.min.js"></script>

Node.js

var Class = require('oopify').Class;

ES6 Modules

import { Class } from 'oopify';

Usage

var Figure = Class.create(function ($public, $protected, _) {
    $protected.id = 123;
    $public.getId = function () {
        return ('00000' + _(this).id).slice(-5);
    };
});

var Circle = Class.create(Figure, function ($public, $protected, _) {
    $public.radius = 10;
    $protected.init = function () {
        _(this).id = 456;
    };
});

var circle = new Circle();
console.log(circle.id); // '00456'

Features

public, protected and private

Use $public for define public members, $protected for define protected members. Use _(this) to access protected and private members of a class. Not declared as protected members of the class are considered as private.

this in protected methods (except init()) points to a protected storage. To access the object use this.self.

Use this.property = in init class to implement static members.

var Figure = Class.create(function ($public, $protected, _) {
    $public.x = 0;
    $public.y = 0;
    $protected.name = 'figure';
    $protected.init = function (x, y) {
        _(this).id = 123; // private
        this.x = x;
        this.y = y;
    };
    $protected.protectedMethod = function () {
        console.log('protectedMethod: ', this.id, this.name, this.self.x, this.self.y);
    };
});

var Circle = Class.create(Figure, function ($public, $protected, _) {
    $public.radius = 10;
    $public.publicMethod = function () {
        console.log('publicMethod: ', _(this).id, _(this).name, this.radius);
        _(this).protectedMethod();
    };
    this.square = function (circle) {
        return 2 * Math.PI * circle.radius;
    }
});

var circle = new Circle(2, 7);
circle.radius = 5;
circle.publicMethod(); // publicMethod: undefined figure 5 / protectedMethod: 123 figure 2 7
console.log(Circle.square(circle)); // 31.415926536

Basic inheritance, call super

Use $super.get(Class) to access parent members:

var Animal = Class.create(function ($public, $protected, _) {
    $public.category = 'generic';
    $protected.name = null;
    $protected.init = function (name) {
        _(this).name = name;
    }
});

var Dog = Class.create(Animal, function ($public, $protected, _, $super) {
    $protected.breed = null;
    $protected.init = function (name, breed) {
        $super.get(Animal).init.apply(this, arguments);
        _(this).breed = breed;
    }
});

Multiple class inheritance

When name conflict used the implementation of the first class that contains that member. To implement all parenting methods, override them with a call $super for each class.

Only the first class is used for standard JavaScript chain of prototypes, and it can be checked by instanceof.

var Layer = Class.create(function ($public, $protected, _) {
    $protected.uid = null;
    $protected.init = function () {
        _(this).uid = Date.now();
    }
});

var Movable = Class.create(function ($public, $protected, _) {
    $public.x = 0;
    $public.y = 0;
    $protected.init = function (x, y) {
        this.x = x;
        this.y = y;
    }
    $public.move = function () {
        this.x++;
        this.y++;
    }
});

var MovableLayer = Class.create([Layer, Movable], function ($public, $protected, _, $super) {
    $protected.init = function (x, y) {
        $super.get(Layer).init.apply(this, arguments);
        $super.get(Movable).init.apply(this, arguments);
    }
});

Class.is()

instanceof not working with multiple inheritance class for all non-first base classes. To solve this problem, use Class.is():

var layer = new MovableLayer(); // see previous example
console.log(layer instanceof Layer, layer instanceof Movable); // true false
console.log(Class.is(layer, Layer), Class.is(layer, Movable)); // true true

Getters/setters

If a member is not defined in the public/protected prototype, and while there are methods get* or a set*, it automatically creates the getter/setter for this property.

var Human = Class.create(function ($public, $protected, _) {
    $protected.birthday = null;
    $public.getBirthday = function () {
        return _(this).birthday;
    };
    $public.setBirthday = function (day) {
        _(this).birthday = day;
    };
    $public.getAge = function () {
        var date = new Date(_(this).birthday);
        return Math.floor((Date.now() - date.getTime()) / (1000 * 3600 * 24 * 365));
    };
});

var human = new Human();
human.birthday = '1975-05-01';
console.log(human.age);

Mixins

Mixin is simple function, which is called as implementation of class. All members is copied as if they were in the class.

var SortableMixin = function ($public, $protected, _) {
    $public.sort = function () {
        _(this).data.sort();
    };
};

var Archive = Class.create(null, SortableMixin, function ($public, $protected, _) {
    $protected.init = function () {
        _(this).data = [3, 9, 7, 2];
    };
    $public.outData = function () {
        console.log(_(this).data);
    };
});

var archive = new Archive();
archive.sort();
archive.outData(); // [2, 3, 7, 9]

Testing and building

Install dependency:

npm install

Build:

npm run-script build:dev
npm run-script build:dist

To run test in node.js use:

npm test

To run test in browsers open test/index.html page.

Browser support

With WeakMap Shim:

• Internet Explorer 9+
• Chrome 5+
• Firefox 4+
• Opera 12.1+
• Safari 5+
• Firefox Mobile 4+
• Android Browser 2.3+
• iOS Safari 5.1+

Without WeakMap Shim:

• Internet Explorer 11+
• Chrome 36+
• Firefox 6+
• Opera 23+
• Safari 7.1+
• Firefox Mobile 6+
• iOS Safari 8+