document.getelementbyId will return null if element is not defined?

Question

In my code, I see this:

if (document.getElementById(\'xx\') !=null) {
    //do stuff
}

if xx element is not defined, will this

Answer 1

Yes it will return null if it's not present you can try this below in the demo. Both will return true. The first elements exists the second doesn't.

Demo

Html

Javascript:

   if (document.getElementById('xx') !=null) 
     console.log('it exists!');

   if (document.getElementById('xxThisisNotAnElementOnThePage') ==null) 
     console.log('does not exist!');