Map.has( ) In JavaScript

Hi, I have been using the HTML and javascript for a while in Map. I just realized that after inserting a value with javascript/jquery the answer is not recognized by Map. I have to google it to learn more thinks about the Javascript map and I have found some good results but didn't get the right query about it. I am stuck between the code. Please check it, Is it right?

Self : {self}
 

<script>
$(document).ready(function(){
 var whatiwant = "this is what I want";
 $("#answer714997X7X98").val(whatiwant);
});
</script>