The WeakSet add() method adds a new element to the end of a WeakSet object.
Syntax:
weakSetObj.add(value)
Parameters:
value: It represents the element to add.
Returns:
Updated WeakSet object.
Example:
<!DOCTYPE html>
<html>
<body>
<script>
var hello = new WeakSet();
var obj={};
hello.add(obj);
document.writeln(hello.has(obj));
</script>
</body>
</html>