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About the test

The JavaScript online test assesses candidates' knowledge of programming in the JavaScript language and its main application, Web front-end development.

It's an ideal test for pre-employment screening. A good JavaScript developer needs to be able not only to solve problems using JavaScript as the programming language but also to understand its specifics, such as prototypes, closures, event loop, and variable scope.

This online test requires candidates to solve coding problems in JavaScript and find and fix bugs in JavaScript programs.

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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43 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, Memory Game, Post Comment, Row Appender, Vectors, Segment, Special Actions, Height, Product Rating, Validation, Cards, Array Search, Screen, Timer, Username, Snapshot, Scale Font Size, Products, Paragraph, Hide Button, A Tag, Hobbies, Loading Bar, Log Patch, Double, Table of Names, Filter, Reorder, Date Transform, New Folder, Trading Data Paging.

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
  • Strings
  • Content Manipulation
  • DOM Manipulation
  • Arithmetic
  • Iteration
  • Attribute Manipulation
  • Forms
  • Recursion
  • Bug Fixing
  • ECMAScript 2015
  • Asynchronous Calls
  • Callback
  • Regex
  • Styling
  • JSON
  • Sorting
  • HTML5
  • Monkey Patching
  • Pagination

For job roles

  • JavaScript Developer
  • Web Front-End Developer

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