This JavaScript Algorithms Online Test Separates Good From Bad Hires

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About the test

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.

Sample public questions

New
Easy
15 min
code
Public
JavaScript
Algorithmic Thinking
Linked List
Set

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());
Easy
30 min
code
Public
JavaScript
Algorithmic Thinking
Dictionary

Write a function that, when passed an array and a target sum, returns, efficiently with respect to time used, two distinct zero-based indices of any two of the numbers, whose sum is equal to the target sum. If there are no two numbers, the function should return null.

For example, findTwoSum([ 3, 1, 5, 7, 5, 9 ], 10) should return an array containing any of the following pairs of indices:

  • 0 and 3 (or 3 and 0) as 3 + 7 = 10
  • 1 and 5 (or 5 and 1) as 1 + 9 = 10
  • 2 and 4 (or 4 and 2) as 5 + 5 = 10

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4 more premium JavaScript Algorithms questions

Max Sum, Unique Numbers, Friend, Paper Strip.

Skills and topics tested

  • JavaScript
  • Algorithmic Thinking
  • Dictionary
  • Graphs
  • Arrays

For job roles

  • JavaScript Developer
  • Web Front-End Developer

Sample candidate report

What others say

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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.

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