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 give

Answer 1

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)