Function call and parenthesis. Why aren't we using them here.

Hey Bappy,

You're right. When we call a function, we use () to denote to the compiler that we want the function executed right then and there. However, leaving off the () allows us to point to a function in the case of an event. The way the compiler works is that when () are beside of a function name, it will execute the function immediately. That would be a bad idea because the function would fire off immediately (without regard to the event handler) upon page load and then you wouldn't be able to use it further because there is no reference to it. If you leave off parenthesis, however, it will be used as a reference so that it can be called back. These functions are generally known as callback functions.

Hi Bappy,

It's because we don't want that function called at the point when this code is reached and executed.

Instead, we want to pass in a reference to the function so that the .focus method can call our passwordEvent function for us anytime the element receives focus.

If you put in the parentheses then that means the passwordEvent function will be called immediately when that code is reached and the return value of that function is what will be passed into the .focus() method which is not the behavior we wanted.