JavaScript Algorithms Online Test
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The JavaScript Algorithms online test assesses candidates' algorithmic-thinking skills and their ability to implement algorithms using JavaScript.
It's an ideal test for pre-employment screening. A good developer will be able to design and implement algorithms that are both correct and efficient. Computational complexity is important not only when scaling applications but also when creating responsive, maintainable, and efficient code.
This online test requires candidates to analyze or design algorithms in JavaScript.
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Free Sample Questions for JavaScript Algorithms Test
Our sample questions are free for companies to use on a trial plan. See more about our premium questions for paid plans below.
Ensure
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.
Even Numbers
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: }
(Select all acceptable answers.)
Song
A playlist is considered a repeating playlist if any of the songs contain a reference to a previous song in the playlist. Otherwise, the playlist will end with the last song which points to undefined.
Implement the method isRepeatingPlaylist that, efficiently with respect to time used, returns true if a playlist is repeating or false if it is not.
For example, the following code prints "true" as both songs point to each other.
let first = new Song("Hello");
let second = new Song("Eye of the tiger");
first.nextSong = second;
second.nextSong = first;
console.log(first.isRepeatingPlaylist());
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Premium Questions for JavaScript Algorithms Test
TestDome offers a premium questions library with 1000+ unique, hand-crafted questions whose answers can’t be found online. If you spot an answer somewhere online, we’ll give you a refund.
Question Names
These premium questions are included in this pre-built test and can be added to any multi-skill test. Please sign up for a paid plan to view the questions in detail.
Unique Numbers, Max Sum, Unique ProductCovered Skills
Testing of these skills is covered in this pre-built test because they’re closely related. On our paid plan, you can easily create your own custom multi-skill tests.
JavaScriptRecommended Job Roles
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