JavaScript why its returning the “undefined” instead of 1

I am new to javascript, The below question should return 1 according to my knowledge about javascript, but it's returning "undefined". could anyone tell me why it's not returning 1?

 var foo = {
    bar: function() { return this.baz; },
    baz: 1
  };
  (function(){
    return typeof arguments[0]();
  })(foo.bar);
Answer:1

When you invoke a function with . operator, then the object to the left of . becomes the context of invocation, which is this. But when you pass your function to another one as an argument, you lose the context, since you call it directly. If you want to preserve the context you can use bind.

(function(){
    return typeof arguments[0]();
})(foo.bar.bind(foo));

And, yeah, your function actually returns the type of baz, not the value itself. Remove typeof if you want to see 1.

Answer:2

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