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About the test

The HTML/CSS, JavaScript, Java Algorithms, and SQL online test assesses candidates' knowledge across the whole Web stack from HTML, CSS, and JavaScript on the Web front-end over algorithmic-thinking skills in Java on the back-end to SQL for data access.

It's an ideal test for pre-employment screening. A good full stack Java developer needs to be able to use a wide range of technologies, and solve back-end problems of a significant computational complexity.

This online test requires candidates to solve coding problems, find and fix bugs in multiple technologies, and analyze or design an algorithm using Java as the programming language.

Sample public questions

Easy
7 min
code
Public
HTML/CSS
Borders
Element Size
Styling

Every user on your website has an image avatar that is displayed when they post a comment. You want to style these images differently from other images on your site. Add a CSS class named avatar that fulfils the following requirements:

  1. The avatar's border is rounded, so that it appears as a circle.
  2. The avatar's width and height are both 150px.
  3. The avatar has a solid border, has a width of 2px, and be colored gray.

For example, the avatar in the template should look like:

Cat avatar

Easy
15 min
code
Public
Java
Algorithmic Thinking
Recursion
Tree

A three-node binary tree.Binary search tree (BST) is a binary tree where the value of each node is larger or equal to the values in all the nodes in that node's left subtree and is smaller than the values in all the nodes in that node's right subtree.

Write a function that, efficiently with respect to time used, checks if a given binary search tree contains a given value.

For example, for the following tree:

  • n1 (Value: 1, Left: null, Right: null)
  • n2 (Value: 2, Left: n1, Right: n3)
  • n3 (Value: 3, Left: null, Right: null)

Call to contains(n2, 3) should return true since a tree with root at n2 contains number 3.

Easy
3 min
code
Public
JavaScript
Error Handling
Language

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.

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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137 more premium HTML/CSS, JavaScript, Java Algorithms, and SQL questions

Positive Numbers, Links, Truthy Expressions, Ad, Article Style, Baby Names, Cities, Editor, Format Table, Keywords, Label Color, Loading, Logo, Shirts, Upload, Warehouse, Widgets, iframe, Max Sum, Launch Time, Function Wrapper, Link, Log Parser, Unique Numbers, Load URL, Photon Frequency, Addition, Color Codes, Tax Calculator, Bookmark, Screen Reader, Game Offer, Bicycle Report, Curious Leaf, Gaming Console, Travel Blog, Confirm, Blog, 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, Christmas Tree, Timesheet, Email Tables, Data Entry, Price List, Ice Cream Flavors, Memory Game, TestDome Logo, River Discharge, ATM Locations, Post Comment, Row Appender, Segment, Height, Product Rating, Validation, Cards, Array Search, Screen, Timer, Username, Snapshot, Scale Font Size, Products, Paragraph, Hide Button, A Tag, Hobbies, Loading Bar, Log Patch, Double, Table of Names, Filter, Transactions, Reorder, Share Button, Max Sum, Platformer, Unique Numbers, Book Sale, Friend, Stories, Moving Total, Internal Nodes, Unique Product, Merge Stock Index, Date Transform, Ban Users, Trading Data Paging, New Folder, Shipping, Chain Link, Node, Read Write Execute, Car Rental, Veterinarian, Numbers To Text, Wheel Defects, Paper Strip, Paper Strip, Flight Connections, Vectors, Special Actions.

Skills and topics tested

  • JavaScript
  • Closures
  • HTML/CSS
  • CSS Selectors
  • Styling
  • Language
  • Element Spacing
  • Flexbox
  • Positioning
  • Fonts
  • Elements and Attributes
  • HTML5
  • Animation
  • Forms
  • Hyperlink
  • IFrame
  • Algorithmic Thinking
  • Timing Events
  • Exceptions
  • Serialization
  • XML
  • Dictionary
  • Ajax
  • HTTP
  • Promise
  • Arrays
  • CSS Advanced
  • Element Size
  • Associative Arrays
  • Classes
  • Objects
  • Bookmarks
  • Accessibility
  • CSS Basics
  • Tables
  • Responsive Design
  • UI
  • Dialog Box
  • Event Handling
  • Semantic Tags
  • Graphs
  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Bug Fixing
  • Indexes
  • Alter Table
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Borders
  • Inline Styles
  • Selectors
  • Strings
  • CSS Layout
  • Database Normalization
  • Content Manipulation
  • DOM Manipulation
  • Arithmetic
  • Attribute Manipulation
  • Recursion
  • ECMAScript 2015
  • Asynchronous Calls
  • Callback
  • Regex
  • JSON
  • Sorting
  • Iteration
  • Monkey Patching
  • Java
  • Data Structures
  • Linked List
  • HashMap
  • Dynamic Programming
  • HashSet
  • Tree
  • Pagination
  • Queue
  • StringBuilder

For job roles

  • Full-Stack Developer
  • Java Developer
  • JavaScript Developer
  • SQL Developer
  • Web Developer

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Simple, straight-forward technical testing

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