js OOP by Rick Waldron

readme.md

the following code samples are taken from a great answer posted on Quora by Rick Waldron

i'm keeping them here for future reference.

class-es6.js

class Point {
  constructor( x, y ) {
    this.x = x;
    this.y = y;
  }
  plus( aPoint ) {
    return new Point( this.x + aPoint.x, this.y + aPoint.y );
  }
  distance() {
    return Math.sqrt( this.x * this.x + this.y * this.y );
  }
}


var p = new Point( 5, 10 );

class-pattern.js

var Point = (function() {
  function Point( x, y ) {
    this.x = x;
    this.y = y;
  }

  Point.prototype.plus = function( aPoint ) {
    return new Point( this.x + aPoint.x, this.y + aPoint.y );
  };

  Point.prototype.distance = function() {
    return Math.sqrt( this.x * this.x + this.y * this.y );
  };

  return Point;

})();


var p = new Point( 5, 10 );

john-resig-oop.js

/* Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 */
// Inspired by base2 and Prototype
(function(){
  var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/: /.*/;
  // The base Class implementation (does nothing)
  this.Class = function(){};
  
  // Create a new Class that inherits from this class
  Class.extend = function(prop) {
    var _super = this.prototype;
    
    // Instantiate a base class (but only create the instance,
    // don't run the init constructor)
    initializing = true;
    var prototype = new this();
    initializing = false;
    
    // Copy the properties over onto the new prototype
    for (var name in prop) {
      // Check if we're overwriting an existing function
      prototype[name] = typeof prop[name] == "function" && 
        typeof _super[name] == "function" && fnTest.test(prop[name]) ?
        (function(name, fn){
          return function() {
            var tmp = this._super;
            
            // Add a new ._super() method that is the same method
            // but on the super-class
            this._super = _super[name];
            
            // The method only need to be bound temporarily, so we
            // remove it when we're done executing
            var ret = fn.apply(this, arguments);        
            this._super = tmp;
            
            return ret;
          };
        })(name, prop[name]) :
        prop[name];
    }
    
    // The dummy class constructor
    function Class() {
      // All construction is actually done in the init method
      if ( !initializing && this.init )
        this.init.apply(this, arguments);
    }
    
    // Populate our constructed prototype object
    Class.prototype = prototype;
    
    // Enforce the constructor to be what we expect
    Class.constructor = Class;

    // And make this class extendable
    Class.extend = arguments.callee;
    
    return Class;
  };
})();

var Foo = Class.extend({
  init: function(isFoo){
    this.foo = isFoo;
  },
  getFoo: function(){
    return this.foo;
  }
});

var Bar = Foo.extend({
  init: function() {
    // this actually calls the init method 
    // defined in Foo

    this._super( true );
  }
});


console.log( Foo);

var foo = new Foo(), 
    bar = new Bar();

console.log( foo, bar );