JSFiddle - React, Tailwind, and code Playground

HTML

<div id="return"></div>

JavaScript

function get(){
  var map = {'key1': 'value1', 'key2': 'value2'};
 if ('key1' in map) {
   return 'hello';
} else {
   return 'kirti';
}
}
var a = get();
document.getElementById('return').innerHTML = a;