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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();