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

console.log(document.getElementById('xx') ) evaluates to null.

document.getElementById('xx') !=null evaluates to false

You should use document.getElementById('xx') !== null as it is a stronger equality check.