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JavaScript and Node.js Online Test

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The JavaScript and Node.js online test assesses candidates' knowledge of JavaScript language and specific Node.js features.

It's an ideal test for pre-employment screening. A good Node.js developer needs to be able not only to solve problems using Node.js but also to be familiar with the Node.js ecosystem.

This online test requires candidates to solve coding problems in JavaScript and Node.js.

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Free Sample Questions for JavaScript and Node.js Test

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Ensure

3min
  -  
Easy  
  -  
CODE

JavaScript Error Handling Language Public

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.

Config

3min
  -  
Easy  
  -  
MCA

Node.js NPM Public

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.

(Select all acceptable answers.)

Even Numbers

5min
  -  
Easy  
  -  
MCA

JavaScript Attribute Manipulation Bug Fixing Selectors Styling New Public

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.)

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Premium Questions for JavaScript and Node.js 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.

Covered 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.

JavaScript Arrays Closures DOM Manipulation Event Handling Language Strings Monkey Patching HTML5 Node.js Modules Events Arithmetic Iteration Attribute Manipulation Asynchronous Calls Regex JSON Serialization Sorting Content Manipulation Styling Objects Callback Bug Fixing Classes ECMAScript 2015 Recursion Asynchronous Programming Forms Async-Await Promise Algorithmic Thinking Timing Events Stream Exceptions NPM Event Loop Event Emitter XML Dictionary Ajax HTTP Pagination Associative Arrays Dialog Box
Recommended Job Roles

These are the job roles that we recommend for the JavaScript and Node.js online test.

Back-End Developer
JavaScript Developer
Node.js Developer

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