typeof in JavaScript

1. var x = function(){};
   alert(typeof x);
      ...is going to bubble up: function
    
2. var x = 33;
   alert(typeof x);
      ...is going to bubble up: number
    
3. var x = "Hello World.";
   alert(typeof x);
      ...is going to bubble up: string
    
4. var x = {
      y: "why not?"
   }
   alert(typeof x);
      ...is going to bubble up: object
    
5. etc.