JSFiddle - React, Tailwind, and code Playground

by Kamlesh Gupta

HTML

<pre>
   if the third argument is fucntion ,it's  callback.It will be called
    from inside function as shown.
    
    if a variable is defined in a function a without var declaration it will create a window specific vaiable .
    
    "use strict" makes the scopness strict.
    <pre>

JavaScript

function add(first,second,callback){
    console.log(first+second);
    callback();
}

add(2,3,function(){
    console.log("done");
});
//to check for the callback exists\
if(callback){
    
   //then call the callback();