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58 interview questions on Javascript - Fundamentalsfor developers (2025)

Test your technical skills before an interview of Javascript - Fundamentals with 58 corrected questions. Beginner, Intermediate or Expert level.

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58 questions
Medium
93 votes3651 runs5 comments

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

Web developer
Vincent Cotroat Jan 18, 2024
Medium
38 votes3344 runs4 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
23 votes3468 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Camilleat Apr 27, 2023
Easy
10 votes3943 runs
5 comments

The certificate variable is not attainable outside the if loop

Web developer
variables
scope
Kahinaat Apr 6, 2022
Easy
10 votes3761 runs
3 comments

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

Web developer
array
spread operator
Kahinaat Jul 19, 2024
Easy
10 votes3704 runs
1 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
Medium
9 votes3938 runs
2 comments

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
9 votes3734 runs2 comments

Write a for in loop in Javascript

Web developer
arrays
loops
Kahinaat Apr 6, 2022
Easy
8 votes3968 runs0 comment

What can be said about ECMAScript?

Web developer
standards
javascript
Kahinaat Apr 12, 2022
Medium
8 votes3798 runs
5 comments

Print the number of countries in the array travel.

Web developer
array
for loop
Vincent Cotroat Sep 5, 2022
Hard
7 votes2505 runs
2 comments

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
7 votes1475 runs3 comments

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

Web developer
objects
arrays
Kahinaat Mar 21, 2022
Easy
6 votes3808 runs
2 comments

Filter the elements of an array in Javascript

Web developer
array
filter
Kahinaat Apr 6, 2022
Medium
6 votes2574 runs
1 comment

Get the current page URL in Javascript

Web developer
javascript
url
Damienat Sep 4, 2023
Easy
5 votes2686 runs
1 comment

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

Web developer
arrays
index
Axelat Sep 4, 2023
Easy
5 votes2205 runs1 comment

Explain the difference between let and const in Javascript

Web developer
variables
mutability
Kahinaat Mar 21, 2022
Medium
5 votes1625 runs
1 comment

What does the variable "promise" take in attribute(s)?

Web developer
promises
functions
Vincent Cotroat May 16, 2022
Easy
4 votes3723 runs0 comment

Add Lyon to the end of the city array

Web developer
arrays
push
Kahinaat Mar 29, 2022
Easy
4 votes2766 runs
1 comment

Remove the last element of an array in Javascript

Web developer
arrays
pop
Kahinaat Apr 6, 2022
Easy
3 votes3785 runs
1 comment

What type is the variable 'apple'?

Web developer
boolean
variable
Kahinaat Mar 21, 2022