Question

I have wriiten

document.createElement("p");
document.createElement("p")

How does Javascript intepreter knows do distinct between those two?

Id ? ( what is the Js property )? maybe something else ?

Answer 1

In this particular case:

document.createElement("p");
document.createElement("p")

the JavaScript runtime doesn’t worry about the elements at all, because you didn’t save the values returned. They’re thrown away.

If you had written,

var p1 = document.createElementById('p');
var p2 = document.createElementById('p');

well then you’ve got two separate variables, and so you’re keeping track of the difference.

It’s important to be aware that the JavaScript interpreter itself doesn’t really care too much about your DOM nodes. That’s not really it’s business. If you call methods and create objects, it’s your problem to keep track of them.