CPD Quiz

const obj1 = {Name: "Hello", Age: 16};

const obj2 = {Name: "Hello", Age: 16};

console.log(obj1 === obj2);

• true

• false

• undefined

• None of the above

Answer explanation

The strict equality operator compares objects by their references so even though the contents of both objects are the same, their references don’t match resulting in false.

function test(...args) {

console.log(typeof args);

}

test(12);

• NaN

• Object

• Array

• Number

Answer explanation

The …args parameter allows us to collect all remaining arguments into an array, and in Javascript typeof an array is an object.

The process in which an object or data structure is translated into a format suitable for transferral over a network, or storage is called?

• Object Serialization

• Object Encapsualization

• Object Inheritace

• None of the Above

Answer explanation

Object Serialization is the process in which an object or data structure is translated into a format suitable for transferral over a network, or storage.

What will be the output of the following code snippet?

function solve(arr, rotations){

if(rotations == 0) return arr;

for(let i = 0; i < rotations; i++){

let element = arr.pop();

arr.unshift(element);

}

return arr; }

console.log( solve([44, 1, 22, 111], 5));

• [ 111, 4 ,1, 22]

• [ 44 ,1 ,22 ,111]

• [1,2,11, 4]

• [1,2,11,4]

Answer explanation

Wrong Answer

The above code snippets rotate an array to its right by some specified number of times(here 5).

function factorial (n){

if (n==0){

return 1;

}

else {

return (n * factorial(n-1));

}

console.log(factorial(3))

• 3

• 6

• 0

• 12

Answer explanation

using recursion calculates the factorial of 3 (3!)= 1*2*3=6

Which of the following is a dynamic data structure ?

• stack

• queue

• Linked List

• All of the Above