HTML/CSS, JavaScript, C#, and SQL Online Test

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The HTML/CSS, JavaScript, C#, and SQL online test assesses candidates' knowledge across the whole Web stack from HTML, CSS, and JavaScript on the Web front-end over C# on the back-end to SQL for data access.

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

This online test requires candidates to solve coding problems and find and fix bugs in multiple technologies.

Recommended Job Roles
.NET Developer
C# Developer
Full-Stack Developer
JavaScript Developer
SQL Developer
Web Developer
Sample Candidate Report

Sample Free Questions



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.



SQL Aggregation Select Public

Given the following data definition, write a query that returns the number of students whose first name is John. String comparisons should be case sensitive.

TABLE students
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL



HTML/CSS Borders Element size Styling Public

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

Alert Service


C# Interfaces Inversion of control Refactoring Public

Refactor the AlertService and AlertDAO classes:

  • Create a new interface, named IAlertDAO, that contains the same methods as AlertDAO.
  • AlertDAO should implement the IAlertDAO interface.
  • AlertService should have a constructor that accepts IAlertDAO.
  • The RaiseAlert and GetAlertTime methods should use the object passed through the constructor.
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JavaScript Arrays C# Stream Strings Exceptions Closures HTML/CSS CSS selectors Styling DOM manipulation Event handling Language SQL Conditions Views Bug fixing Algorithmic thinking Monkey patching Extension methods Arithmetic Data structures HTML5 Subqueries Update TDD Sorting Random Memory management Iteration Attribute manipulation Element spacing Multithreading Synchronization CSS advanced Element size Constraints Create table Database schema Select Create index Performance tuning Flexbox Positioning Alter table Field modifiers Bookmarks Elements and attributes Linked list Aggregation Fonts Accessibility levels Properties Dialog box Ordering Integer division Regex Destructors OOP Refactoring Left join Queue Objects Asynchronous calls Dictionary Lists Indexes Union Group by Insert Joins Tree Hyperlink Animation Serialization XML Recursion JSON StringBuilder Content manipulation Forms Pass by reference Complexity Stack Tables Inheritance CTE Delete Callback Graphs Classes ECMAScript 2015 Borders Inline styles SQL CASE Responsive design Test case design Unit testing HashSet Selectors Method overriding IFrame CSS layout Semantic tags Accessibility Dynamic programming Higher order function Interfaces LINQ
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