JavaScript Online Test
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Sign Up To Use This TestThe 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.
Recommended Job Roles
JavaScript Developer
Web Front-End Developer
Sample Candidate Report
Sample Free Questions
Ensure
3min
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Easy
-
CODE
JavaScript
Error handling
Language
Public
JavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Error handling
Error handling is essential for properly implementing recovery procedures from errors present in a software application.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
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.
Remove Property
7min
-
Easy
-
CODE
JavaScript
Language
Objects
Public
JavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Objects
An object is a self-contained component which consists of methods and properties to make a particular type of data useful. Knowing how to create objects, and work with them, is an essential part of OOP.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
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.
Date
10min
-
Easy
Easy
-
CODE
JavaScript
Strings
Public
JavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Strings
The string data structure is used to represent text. It is one of the most commonly used data structures. Therefore, every programmer should be skilled at string manipulation.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
Write a function that converts user entered date formatted as M/D/YYYY to a format required by an API (YYYYMMDD). The parameter "userDate" and the return value are strings.
For example, it should convert user entered date "12/31/2014" to "20141231" suitable for the API.
Premium Questions
The premium question library contains our unique, hand-crafted questions. We offer a refund if you find any of them answered online.
Questions
Filter, Positive Numbers, Function Wrapper, Double, Truthy Expressions, Table of Names, Word Count, Cards, New Folder, Log Patch, Loading Bar, Array Search, Reorder, Screen, Segment, Hobbies, A Tag, Confirm, Date Transform, Height, Hide Button, Log Parser, Paragraph, Post Comment, Product Rating, Products, Row Appender, Scale Font Size, Snapshot, Stopwatch, Username, Validation, VectorsSkills
JavaScriptJavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Arrays
An array is a container of a fixed number of objects of a similar type. It is a fundamental component of most programming languages.
Closures
Closures are an important concept in any programming language in which functions are first-class citizens.
Exceptions
Exceptions exist in most modern programming languages, making it important for a programmer to understand them and know how to handle them.
DOM manipulation
Dynamically accessing and updating user interface elements is an important part of most modern web applications.
Event handling
Event-based design patterns are very common in modern applications, especially in the development of user interfaces.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Strings
The string data structure is used to represent text. It is one of the most commonly used data structures. Therefore, every programmer should be skilled at string manipulation.
Monkey patching
Monkey Patching is a method of either adding new or overriding existing functionality without the creation of a new type. As such it's an important tool for developers to be familiar with.
HTML5
HTML5 is now supported in all modern browsers, making it important for front-end developers to know how to use its features.
Recursion
A good programmer should be familiar with when to use recursive functions, since they can provide elegant solutions for complex problems.
Bug fixing
Everyone makes mistakes. A good programmer should be able to find and fix a bug in their or someone else's code.
Classes
A class is one of the most widely used and primary structures used in object-oriented programming. As such it's important for any developer to have a working knowledge of how to use it.
ECMAScript 2015
ECMAScript 2015 adds a significant number of features to JavaScript, including classes, modules and range based loops. As such it's important for any JavaScript developer to understand.
Arithmetic
Arithmetic is a fundamental branch of mathematics. An understanding of arithmetic concepts, and their application, is important for every candidate.
Iteration
Iteration is the act of repeating a process, or cycling through a collection. Iteration is one of the fundamental flow control tools available to developers.
Attribute manipulation
Getting and setting HTML attributes is one of the most common coding tasks of that changes something on a web page.
Dialog box
Dialog box, a small window that pops-up, is a common way for communicating information to the user and prompting them for a response.
Regex
A regular expression (regex) is a special text string for describing a search pattern. It is a common way for extracting data from text.
Objects
An object is a self-contained component which consists of methods and properties to make a particular type of data useful. Knowing how to create objects, and work with them, is an essential part of OOP.
Asynchronous calls
Calling methods asynchronously is a common task for programmers.
Serialization
Familiarity with data serialization to and from formats such as XML and JSON is important as it is commonly used for interprocess communication
XML
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The design goals of XML emphasize simplicity, generality, and usability across the Internet. This is one of the most used formats for exchanging data over the web.
Content manipulation
Adding or modifying content is the most common task when developing dynamic web pages.
JSON
JSON is an open-standard format that uses human-readable text to transmit data objects consisting of attribute-value pairs. It's the most common data format used for asynchronous browser/server communication.
Sorting
Every programmer should be familiar with data-sorting methods, as sorting is very common in data-analysis processes.
Styling
Styling user interfaces according to the specification is a daily routine for a front-end developer.
Callback
A callback is a piece of code that can be passed as an argument to another bit of code. It's a very common pattern that has a wide variety of uses, and as such it's important to understand.
Forms
Forms provide a method of grouping inputs and collecting user data. As such, they are important for all front end developers.
Score Distribution
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