CODEWITHSUNDEEP
javascriptclassinheritance
ThomasReggi
ThomasReggi

Reputation: 59365

Access parent "this" variables, from inherited class

I know this is simple and it's probably out there some where I'm just not sure what to look for "class inheritance"? I'm trying to access ship's this function from within cargo. Ideas?

var Ship = function() {
    this.id = Math.floor(Math.random() * 1000000);
};

var Cargo = function(){
    this.id = Math.floor(Math.random() * 1000000);
}

Cargo.prototype.push = function(string){
    return string;
}

Ship.prototype.cargo = Cargo;

module.exports = Ship;

Upvotes: 0

Views: 79

Answers (2)

Ken Kin
Ken Kin

Reputation: 4693

The function of the prototype can already access this of an instance. 

var Ship=function () {
    this.id=Math.floor(Math.random()*1000000);
};

var Cargo=function () {
    this.id=Math.floor(Math.random()*1000000);
};

Cargo.prototype.push=function (string) {
    return string;
};

Ship.prototype.cargo=function () {
    var cargo=new Cargo();
    cargo.ship=this;
    return cargo;
};

var ship1=new Ship();
var cargo1=ship1.cargo();
var cargo2=ship1.cargo();
alert(cargo1.ship.id===cargo2.ship.id);

var ship2=new Ship();
var cargo3=ship2.cargo();
var cargo4=ship2.cargo();
alert(cargo3.ship.id===cargo4.ship.id);

alert(cargo1.ship.id===cargo3.ship.id);

Upvotes: 1

Jed Schneider
Jed Schneider

Reputation: 14671

You could extend the object either using underscore or mimic its source:

http://underscorejs.org/#extend

http://underscorejs.org/docs/underscore.html#section-78

Edit: i think what you want is this.

var Cargo, Ship, cargo;

Ship = (function() {
  function Ship() {}

  return Ship;

})();

Cargo = (function() {
  function Cargo(ship) {
    this.ship = ship;
  }

  return Cargo;

})();

cargo = new Cargo(new Ship());

alert(cargo.ship);

Upvotes: 1

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