This JavaScript Algorithms, Node.js, and SQL Online Test Separates Good From Bad Hires

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About the test

The JavaScript Algorithms, Node.js, and SQL online test assess candidates' algorithmic thinking skills in the JavaScript language, knowledge of specific Node.js features, and their ability to use SQL.

It's an ideal test for pre-employment screening. A good Node.js developer needs to be able to solve problems using Node.js, and also use JavaScript to design and implement algorithms that are both correct and efficient, and to write and analyze SQL queries to access a database.

This online test requires candidates to solve coding problems in JavaScript and Node.js, and write SQL queries that extract, combine, and manipulate data.

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
3 min
mca
Public
Node.js
NPM

Consider the following package.json for a Node.js application:

{
  "name": "skill-measure-app",
  "private": true,
  "version": "1.0.0",
  "main": "lib/main.js",
  "scripts": {
    "build": "npm run cleanup & npm run test & npm run publish",
    "cleanup": "rm -fr ./lib",
    "test": "jest",
    "publish": "npm publish lib"
  },
  "dependencies": {
     "jest": "^23.0.1",
     "custom-package": "file:../custom-package"
  }
}

Select all the correct statements.

Easy
3 min
code
Public
SQL
Aggregation
Select

Given the following data definition, write a query that returns the number of students whose first name is John.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL

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56 more premium JavaScript Algorithms, Node.js, and SQL questions

Fahrenheit Converter, Shopping Cart, Weather Data, File Exists, Retry Request, Run Sequentially, Max Sum, Stream Transform, Package Declaration, Add Id, Hash Bug, Game Action, Arrange Promises, Unique Numbers, Friend, Roads, Authors, Autocomplete, Bank Branches, Cheapest Product, Countries, Developers, Hospital Patients, Index Performance, Menu Items, Movies, Projects, Rectangles, Restaurant Menu, Retirees, SMS Messages, Poll, Users and Accounts, Matching Clothes, Agents, Sales, Employee Manager, Auto Show, Delete Orders, Welfare Organization, Tasks, Manager Sales, Student Rankings, Student Activities, Youngest Child, Movies Live, Department Report, Ingredients, Average Salary, Movie Genres, River Discharge, ATM Locations, Transactions, Merge Stock Index, Ban Users, Paper Strip.

Skills and topics tested

  • Node.js
  • Modules
  • Events
  • Asynchronous Programming
  • Async-Await
  • Promise
  • JavaScript
  • Algorithmic Thinking
  • JSON
  • Stream
  • NPM
  • Event Loop
  • Bug Fixing
  • Event Emitter
  • Exceptions
  • Dictionary
  • Graphs
  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Indexes
  • Alter Table
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization
  • Arrays

For job roles

  • Back-End Developer
  • JavaScript Developer
  • Node.js Developer
  • SQL 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.

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