Implement ES6 syntax of class & extends

New syntax comes with ES6, class and extends emulate object-oriented behavior. However, this is just syntax sugar without any new magic, so it can be implemented merely by Javascript's nature.

class

ES6 syntax of class

class Name {

// class body

constructor(args) { constructor_body }

function method1(args1) { method_body }

}

var name = new Name(args);

name.method1();

It can be implemented by Object

function Name(args) {

constructor_body

}

Name.prototype.method1 = function(args1) {

method_body

};

var name = new Name(args);

name.method1();

extends

ES6 syntax of extends

class ParentClass {

parent_body

}

class ChildClass extends ParentClass {

child_body

}

var parent = new ParentClass(args);

var child = new ChildClass(args);

It can be implemented by literal assign:

function ParentClass(args) {

member1: ...

};

Parent.prototype.method1 = function() { ... };

function ChildClass (args) {

ParentClass.apply(this, args);

}

ChildClass.prototype = Object.crate(ParentClass.prototype);

ChildClass.prototype.constructor = ChildClass;