Question

function katana(){
  this.isSharp = true;
}
katana();
assert( isSharp === true, "A global object now exists with that name and value." );

var shuriken = {
  toss: function(){
    this.isSharp = true;
  }
};
shuriken.toss();
assert( shuriken.isSharp === true, "When it's an object property, the value is set within the object." );

I am actually not getting what is this code trying to tell?. Can anyone explain me what is Context in JavaScript and what exactly does context represent here in the above code?

Answer 1

Well, the reason this === window in the first example and this === shuriken in the second example all has to do with where those functions are created. Notice that when you define shuirken.toss outside of the object, this points to the window object. And when you call katana with new, this points to the newly created object.