​

// CREATE OBJECT

var obj = { "text" : "Hi" };

​

// TEST OBJECT KEY VALUE

alert( "OBJECT TEXT: "+ obj.text );     // Hi

​

​

// CREATE CUSTOM METHOD ( just like e.g. JS's .toUpperCase() method )

Object.prototype.addText = function(){ 

  return this+' there!';  

};

​

// USE CUSTOM .addText() METHOD

alert( "OBJECT TEXT+method: "+obj.text.addText() ); // Hi there! // wow, the method works!

​

​

for(var key in obj){

  alert( 'obj KEYS: '+ key ); // text // addText

}

​

// hmm... addText method as obj Key ???

// ok let's try with a new one...

​

var foobee = { "foo" : "bee" };

​

for(var key in foobee){

  alert( 'foobee KEYS: '+ key ); // foo // addText

}

​

// addText  ...again... but why?