Question 1

What is the output of the following code snippet?

class Shape{};

class Pyramid extends Shape{};

class SquareBasedPyramid extends Pyramid {};

let shape = new SquareBasedPyramid ();

console.log(`${shapeinstance of Shape} ${shape instance of Pyramid } ${shape instance of SquareBasedPyramid }`)

Options :

A : true true true

B : false false true

C : true false true

D : false false false

Answer: A

Question 2

What is the correct way to define an object "person" with properties "firstName", "lastName", and "age"?

Options :

A : const person = {firstName: 'Jane', lastName: 'Doe', age: 30};

B : const person = new Object('firstName' = 'Jane', 'lastName' = 'Doe', 'age' = 30);

C : const person = {'firstName': 'Jane', 'lastName': 'Doe', 'age': 30};

D : const person('firstName' = 'Jane', 'lastName' = 'Doe', 'age' = 30);

Answer: A

Question 3

What is the correct output of the following code:

var obj = {

value: 10

};

var foo = function() {

console.log(this.value);

};

var bar = function() {

console.log(this.value);

};

var boundFoo = foo.call(obj);

var boundBar = bar.bind(obj)();

console.log(boundFoo === boundBar);

Options :

A : 10 10 false

B : 10 undefined false

C : 10 10 true

D : undefined 10 false

Answer: C

Question 4

What is the value of property "y" in object "point2" after the following code is executed?

let point = {x: 100, y: 200};

let point2 = {...point};

point2.y = 300;

Options :

A : undefined

B : 100

C : 300

D : 200

Answer: C

Question 5

What will be the value of x after the following code is executed?

let x = 10;

function add5(num) {

num += 5;

return num;

}

x = add5(x);

Options :

A : None of the Above

B : 10

C : 15

D : 5

Answer: C