JavaScript coding interview questions and tests

JavaScript is a must-have for every front-end developer. The tasks of the front-end developer nowadays require using a wide range of tools and knowing multiple programming languages. You can check the skills of your candidate using our JavaScript coding interview questions and tests to have a good understanding of how proficient they are.

The developer has to combine the knowledge of JavaScript with at least one of the popular frameworks like Angular, React or Vue. With Devskiller JavaScript coding interview questions and tests you can identify developers with the exact skill set you need to grow your company.

Technologies covered:

Programming language: JavaScript

Java frameworks and libraries: Angular, AngularJS, React, Ember, Backbone, Meteor, jQuery and others

Build tools: NPM, Gulp, Bower

React Native
SENIOR
Tested skills
Duration
108 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Hard

React Native | Movie Store - Implement an application which allows users to buy all the movies they can imagine.

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JavaScript
JUNIOR
Tested skills
Duration
35 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, React

Programming task - Level: Easy

JavaScript | React | Search-Engine Application - Implement an application to search and filter products in an online shop.

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Angular
MIDDLE
Tested skills
Duration
81 minutes max.
Evaluation
Automatic
Test overview

Programming task

solve a programming challenge that involves Angular 2+ Components Medium

Choice questions

assessing knowledge of Routes, Promise, Dependency management, Node frameworks, Reading from a file, Application structure best practices, Computed properties, Using HTTPS, EventEmitter one-time events.

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React Native
MIDDLE
Tested skills
Duration
101 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Medium

React Native | HR Companion App - Implement an application to help HR department with maintaining the list of job candidates to be evaluated.

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React Native
JUNIOR
Tested skills
Duration
70 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Easy

React Native | Ultimate BugTracker - Implement missing features and fix bugs in the application used as an in-house bug tracker of a software house.

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JavaScript
JUNIOR
Tested skills
Duration
56 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Easy

JavaScript | Orders Analyzer | Find a total ordered quantity of a product for every weekday - Implement OrdersAnalyzer#averageDailySales method that will return a map with a name of a day of the week as a key and a sum of ordered quantity for a given product id as a value.

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Java
JUNIOR
Tested skills
Duration
68 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Java

Programming task - Level: Easy

Java | Find duplicates - Implement findDuplicates method that returns a new list containing duplicates which occured N-times.

Choice questions

assessing knowledge of ES6, JavaScript, Typescript

Programming task - Level: Easy

JavaScript | Node.JS | Websocket server - Complete the server.js file in order to finish the WebSocket server.

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PHP
MIDDLE
Tested skills
Duration
60 minutes max.
Evaluation
Automatic
Test overview

Code gaps

assessing knowledge of SQL

Choice questions

assessing knowledge of ES6, JavaScript, CSS, HTML, WCAG 2.0, Web Accessibility

Programming task - Level: Medium

PHP | Categories Repository - Implement PDO queries that will return valid results about movies to users.

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PHP
SENIOR
Tested skills
Duration
88 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of SQL, ES6, JavaScript, AJAX, Web development

Programming task - Level: Hard

PHP | XML-CSV Converter - Implement filtering and data transformation methods to pass all the tests.

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HTML
SENIOR
Tested skills
Duration
133 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of AJAX, JavaScript, Web development, ES6, Typescript, CSS, HTML

Programming task - Level: Hard

JavaScript | Social Media Queries | Find friends by name - Implement a function to find user's friends by their name.

Programming task - Level: Hard

CSS/HTML - Flexbox navigation bar - Complete CSS definition and use Flexbox to layout components.

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