JSFiddle - React, Tailwind, and code Playground

JavaScript

function doMe(){

    a = "123";
    var b = "321";
    alert("a:"+a+"  --  b:"+b);
    b = "something else";
    alert("a:"+a+"  --  b:"+b);
    
};


doMe()
alert("a:"+a+"  --  b:"+b); // `b` will not be defined, check console.log