Javascript Quiz For Intermediates | Quiz 1

Multiple choice questions are good for testing your knowledge of basic information, such as memorizing information. However, these do not show how well you can solve real-world problems. To really test your coding skills you better include practical exercises and real projects, where you get to build, break and fix things like a true coding unicorn.

Question 1

What will be the output of the following code?

console.log(a);
var a = 5;

5

undefined

Error

null

Question 2

Which of these options shows the right way to create a function in Javascript?

function myFunc() {}

def myFunc() {}

function:myFunc() {}

func myFunc() {}

Question 3

What does '===' operator check in JavaScript?

Checks for equality of value

Checks for equality of type and value

Checks only data type

Performs type coercion

Question 4

What will the following code output?

let arr = [1, 2, 3];
arr.reverse();
console.log(arr);

[1, 2, 3]

[3, 2, 1]

Error

undefined

Question 5

Which method converts a JSON string to a JavaScript object?

JSON.parse()

JSON.stringify()

JSON.toObject()

JSON.convert()

Question 7

What will this code log to the console?

let x = 1;
function increment(y) {
    return x + y;
}
console.log(increment(2));

2

3

NaN

undefined

Question 8

Which of the following is used to create a new array by applying a function to each element in the original array?

map()

filter()

reduce()

forEach()

Question 9

What will the following code output?

console.log(typeof null === 'object');

false

true

Error

undefined

Question 10

How can you declare a variable that cannot be reassigned in JavaScript?

var

let

const

immutable

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