003-Variable-Strict-mode.js

/*

Author : Jaydatt Patel
'use strict' : 
 This mode allow to use variable which are defined with var,let and const. If you use variable without declare then it will give error 'ReferenceError': variable is not defined 
*/

//error 'ReferenceError': variable is not defined
// 'use strict';
// a = 10;
// console.log(a);

//error 'ReferenceError': variable is not defined
// function foo(){
//     'use strict';
//     a = 10;
//     console.log(a)
// }
// foo();