Is possible to initialize an object in javascript in this way?

Question

I'd like to initialize an object in javascript calling directly a method that belongs to it:

  var obj = (function(){
      return{
          init: function(){
              console.log("initialized!");
              return this;
          },
          uninit: function(x){
              console.log("uninitialized!");
          }
      };
  }).init();

  //later
  obj.uninit();
  obj.init();

This specific example doesn't work, is there something similar?

Tom Bartel · Accepted Answer · 2010-05-16 10:19:53Z

7

EDIT: init() returns this, thanks Guffa.

You're only defining an anonymous function, but not actually calling it. To call it right away, add a pair of parentheses:

var obj = (function(){
  return{
      init: function(){
          console.log("initialized!");
          return this;
      },
      uninit: function(x){
          console.log("uninitialized!");
      }
  };
})().init();

edited May 16, 2010 at 10:19

answered May 15, 2010 at 15:34

Tom Bartel

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5 Comments

Guffa Over a year ago

Also, the init function needs to return this so that there is something to put in the obj variable.

Manuel Bitto Over a year ago

Right, thanks for the clarification Guffa, I've edited my question.

KooiInc Over a year ago

In this case 'var obj =' is not really necessary, is it?

caltuntas Over a year ago

as I see it is already global variable and not necessary here to define var.But if you dont define var in a function, it will be defined in global context so things can go wrong.

Manuel Bitto Over a year ago

@Kooilnc: here var obj = is necessary to get obj reference, so we can call it later.

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