Why does the value of “this” changes.?

Question

I am learning javascript and i came across a doubt. Why is the value of \"this\" undefined in the first example , but prints out correctly in the second.

example 1:<

Answer 1

In the first case, the implicit this object is the global scope. Because there is no myName in the global scope, you get undefined.

If you want a free function with the proper this, use bind:

var hello = myNamespace.myObject.sayHello.bind(myNamespace.myObject);