JavaScript Programming MCQ

Welcome to your JavaScript Programming MCQ

How do you check the type of a variable in JavaScript?

typeOf(x);

x.type();

type(x);

typeof x;

None

What is the output of console.log(10 % 3); in JavaScript?

None of the above

None

How do you declare a class in JavaScript?

class MyClass {}

define class MyClass {}

typedef class { ... } MyClass;

class { ... } MyClass;

None

How do you iterate through an array in JavaScript?

for (let i = 0; i < array.length; i++) {}

for (i = 0; i < array.length; i++) {}

for (let i = 0; i <= array.length; i++) {}

foreach (let i in array) {}

None

What is the purpose of else statement in JavaScript?

Executes a block of code if the condition in if is false

Declares a variable

Initializes memory

None of the above

None

What is the purpose of document.getElementById() in JavaScript?

Sets the ID of an element

Creates a new element

None of the above

Retrieves an element by its ID from the DOM

None

What does the Math.random() function return in JavaScript?

A random number between 0 (inclusive) and 1 (exclusive)

None of the above

A random integer

A random number between 0 and 1 (inclusive)

None

What is the correct way to create a function in JavaScript?

def myFunction() {}

method myFunction() {}

define myFunction() {}

function myFunction() {}

None

How do you declare a variable in JavaScript?

int x;

let x;

variable x;

x = 10;

None

10.

How do you declare a switch statement in JavaScript?

switch (variable) {}

case (variable) {}

select (variable) {}

if (variable) {}

None

11.

How do you declare a for...in loop in JavaScript?

for (let i = 0; i < object.length; i++) {}

for (prop in object) {}

for (let prop in object) {}

foreach (let prop in object) {}

None

12.

How do you define a getter method in a JavaScript class?

propertyName get() {}

getter propertyName() {}

get propertyName() {}

property get propertyName() {}

None

13.

What is the output of console.log("Hello".charAt(1)); in JavaScript?

None of the above

None

14.

How do you declare an async function in JavaScript?

function async myFunction() {}

myFunction async() {}

None of the above

async function myFunction() {}

None

15.

How do you define an object in JavaScript?

let obj = () => {};

let obj = {};

object obj = {};

define obj = {};

None

16.

How do you define a function that accepts parameters in JavaScript?

None of the above

myFunction(param1, param2) {}

function myFunction() {}

function myFunction(param1, param2) {}

None

17.

How do you open a new browser window with URL https://example.com in JavaScript?

window.new("https://example.com");

open.new("https://example.com");

window.open("https://example.com");

open("https://example.com");

None

18.

What is the purpose of await keyword in JavaScript?

Initializes memory

None of the above

Declares a variable

Pauses the execution of async function until a Promise is settled

None

19.

What is JavaScript primarily used for?

Database management

None of the above

Client-side scripting

Server-side scripting

None

20.

What is the output of console.log("JavaScript".length); in JavaScript?

None of the above

None

21.

How do you add a new element to the end of an array array in JavaScript?

None of the above

array.add(newElement);

array.append(newElement);

array.push(newElement);

None

22.

How do you declare a try-catch block in JavaScript?

try { ... } catch (error) { ... }

catch (error) { ... }

try { ... } catch { ... }

try { ... } except (error) { ... }

None

23.

How do you declare an array in JavaScript?

let array(1, 2, 3);

array = [1, 2, 3];

let array = [1, 2, 3];

array(1, 2, 3);

None

24.

How do you print "Hello, World!" in JavaScript?

printf("Hello, World!");

console.log("Hello, World!");

print("Hello, World!");

echo("Hello, World!");

None

25.

What is the purpose of null keyword in JavaScript?

Represents the intentional absence of any object value

Declares a variable

Initializes memory

None of the above

None

26.

How do you comment out a line in JavaScript?

// This is a comment

# This is a comment

/* This is a comment */

None

27.

How do you declare a static method in a JavaScript class?

static methodName() {}

method static methodName() {}

methodName() static {}

methodName static() {}

None

28.

How do you declare a template literal in JavaScript?

"Hello, {name}!"

`Hello, ${name}!`

"Hello, (name)!"

"Hello, ${name}!"

None

29.

What is the purpose of if statement in JavaScript?

Allocates memory

Executes a block of code if a condition is true

Declares a function

None of the above

None

30.

How do you check if an array arr includes a specific element in JavaScript?

arr.has(element);

arr.includes(element);

None of the above

arr.contains(element);

None

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