function base(callback){ callback.call({msg:"hi"}) } function message(){ alert(this.msg) }; base(message); which is the value of alert?

Choose correct answer: 'If you delete an object prototype property, it will..........'

What is the use of isNaN function

What does Object.keys(x) return given the following x object. var x = { 'a': 1, 'b': 2 };

Choose from the following which is true about Javascript

Which is NOT a JavaScript Type?

Which will invoke the browser's Add To Favorite dialog box?

Which declaration is not valid?

What does the following JavaScript code do?

Which are true regarding 'window.onload' and ''?

Which code snippet is more efficient, and why?