JavaScript Online Test

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About the test

The JavaScript online test assesses knowledge of programming in the JavaScript language and core front-end web development concepts. This test contains a series of live coding tasks that are executed inside the Google Chrome web browser.

The assessment includes work-sample tasks such as:

  • Handling user events and manipulating DOM to build responsive web pages.
  • Using classes, objects, and closures to write maintainable and reusable code.
  • Serializing to/from JSON and making AJAX calls.

A good Web front-end or JavaScript developer needs a solid understanding of the JavaScript programming language in order to build modern web pages, fix bugs, and write sustainable code.

Sample public questions

Easy
3 min
code
Public
JavaScript
Error Handling
Language

Implement the ensure function so that it throws an error if called without arguments or the argument is undefined. Otherwise it should return the given value.

Easy
5 min
mca
Public
JavaScript
Attribute Manipulation
Bug Fixing
Selectors
Styling

A Mathematics tutoring web application for kids has a button that highlights all even numbers (in span), using 'yellow' as the background color. Clicking the button again removes the background. All further clicks add or remove the 'yellow' background alternately.

Currently, the button doesn't work as expected. For the given HTML markup and JavaScript function, select all options that will identify and fix the bugs in the JavaScript function:

<div id='numbers'>
 <span>1</span><span>2</span><span>3</span><span>4</span><span>5</span>
 <button id='btn' onclick='toggleEvenColor()'>Toggle even number highlighting</button>
</div>
1: function toggleEvenColor() {
2:   let spanElements = document.querySelectorAll('#numbers span');
3:   spanElements.forEach(function() {
4:     item.style.backgroundColor = 'transparent';
5:   });
6: }

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49 more premium JavaScript questions

Positive Numbers, Truthy Expressions, Max Sum, Launch Time, Function Wrapper, Log Parser, Unique Numbers, Load URL, Photon Frequency, Color Codes, Tax Calculator, Confirm, Friend, Post Comment, Row Appender, Segment, Height, Product Rating, Validation, Cards, Array Search, Screen, Timer, Username, Snapshot, Scale Font Size, Products, Paragraph, Hide Button, A Tag, Hobbies, Loading Bar, Double, Table of Names, Filter, Reorder, Date Transform, Trading Data Paging, New Folder, Shipping, Chain Link, Node, Read Write Execute, Numbers To Text, Paper Strip, Vectors, Special Actions, Log Patch, Memory Game.

Skills and topics tested

  • JavaScript
  • Closures
  • Language
  • Algorithmic Thinking
  • Timing Events
  • Exceptions
  • Serialization
  • XML
  • Dictionary
  • Ajax
  • HTTP
  • Promise
  • Arrays
  • Associative Arrays
  • Classes
  • Objects
  • Dialog Box
  • Event Handling
  • Graphs
  • Content Manipulation
  • DOM Manipulation
  • Arithmetic
  • Attribute Manipulation
  • Forms
  • Recursion
  • Bug Fixing
  • ECMAScript 2015
  • Asynchronous Calls
  • Callback
  • Regex
  • Strings
  • Styling
  • JSON
  • Sorting
  • Iteration
  • HTML5
  • Pagination
  • Linked List
  • Tree
  • Monkey Patching

For job roles

  • JavaScript Developer
  • Web Front-End Developer

Sample candidate report

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