JavaScript function-in-js MCQs | function-in-js Multiple Choice Questions

Direction: Choose the correct option

Which of the following best describes a JavaScript closure?

A. A function inside another function

B. A function that remembers its outer scope

C. A loop structure

D. An object method

Direction: Choose the correct option

Which keyword is used to declare a block-scoped variable?

A. var

B. let

C. static

D. define

Direction: Choose the correct option

What will be the output of the following JavaScript code?


let x = 10;
let y = "10";
console.log(x === y);

A. true

B. false

C. undefined

D. TypeError

Direction: Choose the correct option

What will be printed by the following code?


var a = 5;
function demo(){
  var a = 10;
}
demo();
console.log(a);

A. 10

B. 5

C. undefined

D. Error

Direction: Choose the correct option

Which loop is best suited for iterating over arrays?

A. for

B. while

C. do...while

D. forEach

Quipoin Menu