JSFiddle - React, Tailwind, and code Playground

JavaScript

function iAmTakingTooLong(message1, message2, callback){       
    //setTimeout(function(){ alert('test'); },6000);
    setTimeout(callback(message1+message2),6000);    
}


iAmTakingTooLong('Hello, ', 'sorry I am late!', function(fullmessage){
    alert(fullmessage);
});

alert("I am first!");