JavaScript Online Test
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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
A client has a web page with a series of tasks. They want to implement a reordering feature that behaves like the following example:
After performing the clicks shown in the animation above, the document's body should be:
<div>
<span>Read emails</span>
<button class="downButton" type="button">↓</button>
</div>
<div>
<span>Prepare presentation</span>
<button class="downButton" type="button">↓</button>
<button class="upButton" type="button">↑</button></div>
<div>
<span>Monthly report</span>
<button class="upButton" type="button">↑</button>
</div>
Implement the initialize function to apply the described functionality. The body tag will be prepopulated with the initial HTML which includes all the div, span, and buttons tags. The feature should work with any number of tasks.
A gaming company is working on a platformer game. They need a function that will compute the character's final speed, given a map and a starting speed.
The terrain on which the game character moves forward is made from various pieces of land placed together. Implement the function calculateFinalSpeed which takes the initial speed of the character, and an array of degrees of inclination that represent the uneven terrain.
The speed of the character will increase or decrease proportionally to the incline of the land, as shown in the image below:
The magnitude of the angle of inclination will always be < 90°. The speed change occurs only once for each piece of land. The function should immediately return 0 as the final speed if an incline reduces the speed to 0 or below 0, which makes the character lose 1 life.
For example, the below code:
console.log(calculateFinalSpeed(60, [0, 30, 0, -45, 0]));
should print:
75
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68 more premium JavaScript questions
Truthy Expressions, Function Wrapper, Unique Numbers, Load URL, Photon Frequency, Confirm, Segment, Height, Product Rating, Validation, Array Search, Screen, Username, Snapshot, Scale Font Size, Hide Button, A Tag, Hobbies, Loading Bar, Table of Names, Reorder, Trading Data Paging, New Folder, Chain Link, Special Actions, Log Parser, Log Patch, Cards, Post Comment, Vectors, Airport Networks, Tax Calculator, Numbers To Text, Max Sum, Launch Time, Color Codes, Row Appender, Timer, Read Write Execute, Memory Game, Paragraph, Double, Filter, Node, Planet Search, Digital Flasks, Calories Burned, Students, Chemical Machine, Friend, Positive Numbers, Popular Book, Shipping, Paper Strip, Jogging App, Ticket Transition, Increase Priority, Construction Game, Flimsy Bridge, Parking Allocation, Company Stock, Circuit Simulator, Date Transform, Student Candies, Ecological Experiment, Seasonal Tourism, Adventure Game, Jobs Time.
Skills and topics tested
- JavaScript
- Language
- Closures
- Exceptions
- Algorithmic Thinking
- Dictionary
- Ajax
- HTTP
- Promise
- Arrays
- Dialog Box
- Event Handling
- Arithmetic
- Objects
- Attribute Manipulation
- DOM Manipulation
- Forms
- Recursion
- Bug Fixing
- Classes
- ECMAScript 2015
- Regex
- Strings
- Styling
- Asynchronous Calls
- Iteration
- HTML5
- JSON
- Pagination
- Serialization
- Sorting
- Linked List
- XML
- Monkey Patching
- Content Manipulation
- 2D Array
- Graphs
- Timing Events
- Associative Arrays
- Callback
- Tree
- Conditions
- AI Code Review
- Conditional Statements
- Video
- Loops
For job roles
- JavaScript Developer
- Web Front-End Developer
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What others say
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
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