JavaScript: Calling the unnamed

How does this look like?

o[""]()

A bit like a syntax error, eh? Or an emoticon of some sort. Well, it's valid JavaScript code.

JavaScript objects can have an empty string as a name for a property/method. So if you create an unnamed method called "", you can't call it using the dot notation, but you can, using the brackets.

So type this in your Firebug console:

var o = {
  "": function(){
        console.log('here')
      }
}

then call the unnamed like o[""]()

It works!

Reminds me of the Wizard of Earthsea a little bit where you had to know the true names of things in order to do the wizardry.

Tell your friends about this post on Facebook and Twitter