JSFiddle - React, Tailwind, and code Playground

JavaScript

$x = "hi#1";
 alert($x); //alerts hi#1 as $x is declared globally
 function hi() {
     var $x = "hi#2";
     alert($x);
 }
 hi(); //alerts hi#2 as $x within the function scope is hi#2
 alert($x); //alerts hi#1 the previous $x was defined within the scope.
 function hi3() {
     $x = "hi#3";
 }
 hi3(); //replaces global vairiable $x to hi#3
 alert($x); //alerts hi#3