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
20 min
code
Public
AI-resistant
JavaScript
Arrays
Iteration

Your company is analyzing malware which targets numerical record files.

The malware uses a sliding window over the array of numbers in a file, and tries to match the following pattern:

Tl, -, -, X, -, -, -, Tr

The entire window is moved so that 'X' passes through all the values and is compared to the numbers at the 'Tl' and 'Tr' locations, which are positioned at a constant offset to 'X'.

The malware has the following rules:

  • If the value at the 'Tl' or 'Tr' position of the pattern is bigger or equal to the value at the 'X’ position, the malware replaces the value at 'X' with 0.
  • If the value at the 'Tl' or 'Tr' offset is out of bounds, then the value at 'X' is only compared to the other existing value.
  • The record is processed in two stages: first, all the positions that should be set to 0 are located, using the original values for comparison. Only after all positions have been identified do they get set to 0.

For example, if the values in a record file are the following:

[1, 2, 0, 5, 0, 2, 4, 3, 3, 3]

The expected values after the malware runs are:

[1, 0, 0, 5, 0, 0, 0, 3, 3, 0]

In this example, both '2's, the '4' and the last '3' were replaced by 0.

Implement the simulate function so that the malware behavior is replicated for further study.

Hard
30 min
code
Public
AI-resistant
JavaScript
DOM Manipulation
Event Handling

A client has a web page with a series of tasks. They want to implement a reordering feature that behaves like the following example:

Example case

After performing the clicks shown in the animation above, the document's body should be:

<div>
    <span>Prepare presentation</span>
    <button class="downButton" type="button">&darr;</button>
</div>
<div>
    <span>Read emails</span>
    <button class="downButton" type="button">&darr;</button>
    <button class="upButton" type="button">&uarr;</button>
</div>
<div>
    <span>Monthly report</span>
    <button class="upButton" type="button">&uarr;</button>
</div>

Implement the function initialize to add the requested functionality. The reordering behavior should work with any number of tasks.

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57 more premium JavaScript questions

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

Skills and topics tested

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

For job roles

  • JavaScript Developer
  • Web Front-End Developer

Sample candidate report

What others say

Decorative quote

Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

Jan Opperman, Grindrod Bank

Product reviews

G2 - Crowd Badge
G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2023)

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