JSFiddle - React, Tailwind, and code Playground

by joycse06

JavaScript

(function(){
    console.log('First Case: ');
console.log('Undefined: ', undefined); // Will log `undefined`
    var a ; // a is undefined
console.log('a === undefined :',a  ===  undefined); // true, as a is undefined
console.log('a: ',a); // undefined
})();


(function(){
    console.log('Second Case: ');
    var undefined = 'Something';
    console.log('Undefined: ',undefined); // Will log `something`
    var a ; // a is undefined
    console.log('a === undefined :',a  ===  undefined); // false, as undefined is changed
    console.log('a: ',a); // something
})();