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758 interview questionsfor Front-end developer (2023)

Test your technical skills before an interview of Front-end developer with 758 corrected questions. Beginner, Intermediate or Expert level.

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758 questions
Hard
15 votes962 runs2 comments

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

Web developer
Javascript
arrays
functions
Vincent Cotroat Mar 28, 2023
Easy
12 votes2108 runs1 comment

Create a form with two mandatory fields in Angular

Web developer
Angular
form
validation
Emmanuel Demeyat Jan 4, 2022
Easy
10 votes3845 runs1 comment

Write the missing code to render the children of the UserProfile component.

Web developer
React
props
list
Victor Sabatierat Jan 4, 2022
Easy
9 votes3835 runs0 comment

Write the non-JSX equivalent of the following code:

Web developer
React
jsx
Victor Sabatierat Jan 4, 2022
Expert
8 votes2035 runs1 comment

Which of these methods, allowing to create Providers, does not exist in Angular?

Web developer
Angular
providers
Emmanuel Demeyat Mar 28, 2023
Easy
7 votes2710 runs0 comment

Call a function on the first render of a React component

Web developer
React
hooks
Clément Devosat Jan 4, 2022
Medium
7 votes2069 runs1 comment

Which provider is recommended for DOM manipulation in Angular?

Web developer
Angular
dom
Emmanuel Demeyat Jan 4, 2022
Medium
6 votes3834 runs0 comment

Write a React component as a function

Web developer
React
functions
state
Clément Devosat Jan 4, 2022
Easy
6 votes1660 runs0 comment

The certificate variable is not attainable outside the if loop

Web developer
Javascript
variables
scope
Kahinaat Apr 6, 2022
Hard
6 votes1559 runs1 comment

Write a Javascript code that prints the indexes of an array.

Front-end developer
Javascript
array
for loop
Jean-marie Cléryat Nov 8, 2023
Easy
5 votes119 runs1 comment

Import an add function from a TypeScript module math.ts

Web developer
Typescript
import
module
Lucasat May 30, 2023
Hard
4 votes2779 runs1 comment

Fix the useMemo hook in this React component.

Web developer
React
hooks
Clément Devosat Jan 4, 2022
Easy
4 votes2514 runs0 comment

Which statement(s) are true about hooks?

Web developer
React
hooks
Clément DEVOSat Jan 4, 2022
Hard
4 votes2420 runs1 comment

Write a React component that displays the number 2

Web developer
React
state
useState
Vincent Cotroat Jan 4, 2022
Easy
4 votes1798 runs0 comment

Why is the following snippet not validated? ```jsx <h1>Products Lists</h1> <ul> <li *ngFor="let p of products" *ngIf="p.stock > 0"> {{ p.name }} </li> </ul> ``` Answer: We cannot have ngFor and ngIf on the same element

Web developer
Angular
ngFor
ngIf
Emmanuel Demeyat Jan 4, 2022
Hard
4 votes1632 runs0 comment

What will this code display?

Front-end developer
Javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Medium
4 votes1625 runs0 comment

What can we say about the following code?

Front-end developer
Javascript
variables
Jean-marie Cléryat Jan 4, 2022
Medium
4 votes1625 runs1 comment

Write a Javascript code that displays the contents of the table : Peter, Paul, Jacques, and the length of the table.

Front-end developer
Javascript
arrays
console.log
push
Jean-marie Cléryat Jan 4, 2022
Easy
4 votes1545 runs0 comment

How to optimize a React component to improve its performance?

Web developer
React
performance
Clément Devosat Jan 4, 2022
Easy
4 votes1125 runs1 comment

How to create a navigation section in HTML5

Web developer
HTML5
html
section
Jean-marie Cléryat Dec 1, 2021
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