Wrapper for default date constructor in Javascipt?

Question

I want a kind of wrapper for the default Date object in Javascript so that whenever I have something like var a = new Date(), I want to execute some particular code in the constructor. I basically want to have my own Date class that needs to be invoked whenver a call is made to Date() rather than the native code.

TIA

Answer 1

You need to save the reference for the native Date object, than make your own wrapper, which invokes the native Date then mutates it, or adds additional behavior.

var OldDate = Date;
var Date = function() {
  var that = new OldDate();
  that.mystuff = 5;
  // do other things with the date
  // and execute your own things
  // ...
  return that;
}

var now = new Date();
alert(now.mystuff);

However, I wouldn't mess with native objects.