Check if a div does NOT exist with javascript

Question

Checking if a div exists is fairly simple

if(document.getif(document.getElementById('if')){  } 

But how can I check if a div with the given id does not exist?

Answer 1

var myElem = document.getElementById('myElementId'); if (myElem === null) alert('does not exist!'); 

Answer 2

if (!document.getElementById("given-id")) { //It does not exist } 

The statement document.getElementById("given-id") returns null if an element with given-id doesn't exist, and null is falsy meaning that it translates to false when evaluated in an if-statement. (other falsy values)