Cases where 'this' is the global Object in Javascript

Question

I\'m playing around with different ways to call a function that is an attribute of an Object in Javascript and looking at which type of calls set \'this\' to be the Object a

Answer 1

In the first 3 examples you use the foo object and run its function, thus you get the context from which the function is run, an Object, the foo object.

In the last 2 examples you copy the foo.bar function to the variable f and execute it. In this case the function is executed from the global context, not from the foo Object context. It would be the same as declaring and running

  function f() { 
    console.log('this:' + this);
  }