JavaScript question #Day 9

What’s the output ?

function getAge() {
‘use strict’;
age = 21;
console.log(age);
}

getAge();

A: 21

B: undefined

C: ReferenceError

D: TypeError

Answer: C

With “use strict”, you can make sure that you don’t accidentally declare g…


This content originally appeared on DEV Community and was authored by Sooraj S

What's the output ?

function getAge() {
  'use strict';
  age = 21;
  console.log(age);
}

getAge();
  • A: 21
  • B: undefined
  • C: ReferenceError
  • D: TypeError

Answer: C

With "use strict", you can make sure that you don't accidentally declare global variables. We never declared the variable age, and since we use "use strict", it will throw a reference error. If we didn't use "use strict", it would have worked, since the property age would have gotten added to the global object.


This content originally appeared on DEV Community and was authored by Sooraj S


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