[removed] why “this” inside the private function refers to the global scope?

Question

Consider the following code:

function A() {}    

A.prototype.go = function() {
    console.log(this); //A { go=function()}

    var f = function() {
                


        

Answer 1

The reason why is you are invoking f as a function and not a method. When invoked as a function this is set to window during the execution of the target

// Method invocation.  Invoking a member (go) of an object (a).  Hence 
// inside "go" this === a
a.go();

// Function invocation. Invoking a function directly and not as a member
// of an object.  Hence inside "f" this === window
f(); 

// Function invocation. 
var example = a.go;
example();