JSFiddle - React, Tailwind, and code Playground

JavaScript

var globalOne = 3 ;
testOne();


function testOne()
{
   globalOne += 2;
   alert("globalOne is : " + globalOne );
   globalOne += 1; 
      
}   

alert("outside globalOne is : " + globalOne);

testTwo();

function testTwo()
{
  globalTwo = 20;
  alert("globalTwo is " + globalTwo);  
  globalTwo += 5;  
    
}

alert("outside globalTwo is :" + globalTwo);