[removed] querySelector Null vs querySelector

Question

What is the main difference between these two methods of referencing?

What are the benefits of using one or the other? Also what kind of usage-case would they each

Answer 1

The first statement contains a bool value depends on document.querySelector('.selector') is null or not

var selection = document.querySelector('.selector') !== null;

the second statement contains the actual value of document.querySelector('.selector');

var selection = document.querySelector('.selector');