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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

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.

JavaScript
Error Handling
Language
Easy
3 min
code
Public

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

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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,   Trading Data Paging,   Color Codes,   Tax Calculator,   Confirm,   Friend,   Memory Game,   New Folder,   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.

Skills and topics tested

  • JavaScript
  • Closures
  • Language
  • Algorithmic Thinking
  • Timing Events
  • Exceptions
  • Serialization
  • XML
  • Dictionary
  • Ajax
  • HTTP
  • Promise
  • Arrays
  • JSON
  • Pagination
  • Sorting
  • 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
  • HTML5
  • Monkey Patching

For job roles

  • JavaScript Developer
  • Web Front-End Developer

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