JavaScript Online Test
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The JavaScript online test assesses candidates' knowledge of programming in the JavaScript language and its main application, Web front-end development.
It's an ideal test for pre-employment screening. A good JavaScript developer needs to be able not only to solve problems using JavaScript as the programming language but also to understand its specifics, such as prototypes, closures, event loop, and variable scope.
This online test requires candidates to solve coding problems in JavaScript and find and fix bugs in JavaScript programs.
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Free Sample Questions for JavaScript 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.)
Remove Property
Implement the removeProperty function which takes an object and property name, and does the following:
If the object obj has a property prop, the function removes the property from the object and returns true; in all other cases it returns false.
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Premium Questions for JavaScript 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.
Filter, Positive Numbers, Double, Truthy Expressions, New Folder, Log Patch, Loading Bar, Hobbies, A Tag, Hide Button, Paragraph, Products, Row Appender, Scale Font Size, Snapshot, Username, Timer, Screen, Array Search, Post Comment, Cards, Validation, Table of Names, Max Sum, Reorder, Launch Time, Product Rating, Function Wrapper, Log Parser, Height, Unique Numbers, Load URL, Photon Frequency, Date Transform, Trading Data Paging, Color Codes, Tax Calculator, Confirm, Special Actions, Friend, Segment, Memory Game, VectorsCovered 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.
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