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55 interview questions on Javascript - Fundamentalsfor developers (2024)

Test your technical skills before an interview of Javascript - Fundamentals with 55 corrected questions. Beginner, Intermediate or Expert level.

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55 questions
Hard
50 votes2499 runs4 comments

Understanding the differences between `map()` and `forEach()` methods in JavaScript

Web developer
Vincent Cotroat Jan 18, 2024
Medium
26 votes2297 runs3 comments

Write a JavaScript function that fetches data from an API and logs it to the console.

Web developer
promises
async
Vincent Cotroat Mar 28, 2023
Easy
16 votes2456 runs1 comment

Fix the following Javascript loop:

Web developer
loops
conditions
Camilleat Apr 27, 2023
Easy
9 votes2971 runs1 comment

The certificate variable is not attainable outside the if loop

Web developer
variables
scope
Kahinaat Apr 6, 2022
Easy
8 votes2814 runs2 comments

Use spread operator to split an array into two arrays in Javascript

Web developer
array
spread operator
Kahinaat Jul 19, 2024
Easy
5 votes2992 runs0 comment

What can be said about ECMAScript?

Web developer
standards
javascript
Kahinaat Apr 12, 2022
Medium
5 votes2781 runs2 comments

Print the number of countries in the array travel.

Web developer
array
for loop
Vincent Cotroat Sep 5, 2022
Easy
4 votes2788 runs2 comments

Write a for in loop in Javascript

Web developer
arrays
loops
Kahinaat Apr 6, 2022
Easy
4 votes2775 runs0 comment

Write a Javascript code that displays 'Adversity is not to be feared' and 'There is potentially a real danger'

Web developer
booleans
conditionals
Adrienat Mar 30, 2022
Easy
4 votes1894 runs1 comment

Explain the difference between let and const in Javascript

Web developer
variables
mutability
Kahinaat Mar 21, 2022
Hard
4 votes1516 runs
1 comment

Write a switch statement in Javascript that checks if a person is allowed to go down a slide.

Web developer
switch
if else conditions
Mathisat Oct 20, 2023
Medium
3 votes2934 runs0 comment

Write a switch statement that checks if a person can go down a slide based on their weight and height.

Web developer
switch
if else conditions
Kahinaat Apr 6, 2022
Easy
3 votes1705 runs0 comment

Find the index of the last element of an array in JavaScript

Web developer
arrays
index
Axelat Sep 4, 2023
Medium
3 votes1678 runs0 comment

Get the current page URL in Javascript

Web developer
javascript
url
Damienat Sep 4, 2023
Medium
3 votes1120 runs3 comments

Access the value of the 'level' attribute in a Javascript object

Web developer
objects
arrays
Kahinaat Mar 21, 2022
Hard
3 votes967 runs0 comment

What happens if we execute this code?

Web developer
Florentat Feb 29, 2024
Medium
3 votes676 runs0 comment

What are the advantages of using promises in Javascript?

Web developer
javascript
promises
Vincent Cotroat Nov 20, 2023
Easy
3 votes182 runs1 comment

What is the value of effective?

Web developer
array
length
Vincent Cotroat Apr 12, 2022
Easy
2 votes2833 runs1 comment

Filter the elements of an array in Javascript

Web developer
array
filter
Kahinaat Apr 6, 2022
Easy
2 votes1421 runs0 comment

Explain the difference between `==` and `===` in JavaScript

Web developer
javascript
comparison
Axelat Sep 4, 2023