This HTML/CSS, JavaScript, C# Algorithms, and SQL Online Test Separates Good From Bad Hires

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About the test

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

It's an ideal test for pre-employment screening. A good full stack C# developer needs to be able to use a wide range of technologies, including solving 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 C# as the programming language.

Sample public questions

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

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

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.

C#
Algorithmic Thinking
Recursion
Tree
Easy
15 min
code
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.

JavaScript
Error Handling
Language
Easy
3 min
code
Public

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
SQL
Aggregation
Select
Easy
3 min
code
Public

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133 more premium HTML/CSS, JavaScript, C# Algorithms, and SQL questions

  Positive Numbers,   Links,   Truthy Expressions,   Max Sum,   Ad,   Article Style,   Baby Names,   Cities,   Editor,   Veterinarian,   Format Table,   Keywords,   Label Color,   Loading,   Logo,   Shirts,   Unique Numbers,   Upload,   Warehouse,   Widgets,   Window Manager,   iframe,   Moving Total,   Car Rental,   Max Sum,   Launch Time,   Function Wrapper,   Link,   Log Parser,   Unique Numbers,   Chinese Box,   Load URL,   Photon Frequency,   Addition,   Trading Data Paging,   Color Codes,   Tax Calculator,   Bookmark,   Screen Reader,   Game Offer,   Bicycle Report,   Curious Leaf,   Gaming Console,   Travel Blog,   Confirm,   Blog,   Friend,   Roads,   Authors,   Autocomplete,   Ban Users,   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,   Book Sale,   Unique Product,   Stories,   Internal Nodes,   Friend,   Paper Strip,   Platformer,   Wheel Defects,   Flight Connections,   New Folder,   Post Comment,   Row Appender,   Vectors,   Segment,   Special Actions,   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,   Merge Stock Index,   Date Transform.

Skills and topics tested

  • JavaScript
  • Closures
  • HTML/CSS
  • CSS Selectors
  • Styling
  • Language
  • C#
  • Algorithmic Thinking
  • Element Spacing
  • Flexbox
  • Positioning
  • Fonts
  • Elements and Attributes
  • HTML5
  • Queue
  • Animation
  • Forms
  • Dictionary
  • Linked List
  • Hyperlink
  • IFrame
  • HashSet
  • Sorting
  • Timing Events
  • Exceptions
  • Serialization
  • XML
  • Data Structures
  • Ajax
  • HTTP
  • Promise
  • Arrays
  • CSS Advanced
  • Element Size
  • JSON
  • Pagination
  • 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
  • Alter Table
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Bug Fixing
  • Indexes
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Borders
  • Inline Styles
  • Selectors
  • Strings
  • CSS Layout
  • Database Normalization
  • Dynamic Programming
  • Tree
  • StringBuilder
  • Content Manipulation
  • DOM Manipulation
  • Arithmetic
  • Iteration
  • Attribute Manipulation
  • Recursion
  • ECMAScript 2015
  • Asynchronous Calls
  • Callback
  • Regex
  • Monkey Patching

For job roles

  • .NET Developer
  • C# Developer
  • Full-Stack Developer
  • JavaScript Developer
  • SQL Developer
  • Web Developer

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