This HTML/CSS, JavaScript, Scala, and SQL Online Test Separates Good From Bad Hires

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About the test

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

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

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

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

Implement the uniqueNames function. When passed two vectors of names, it will return a vector containing the names that appear in either or both input vectors. The returned vector should have no duplicates.

For example, calling MergeNames.uniqueNames(Vector("Ava", "Emma", "Olivia"), Vector("Olivia", "Sophia", "Emma")) should return a vector containing Ava, Emma, Olivia, and Sophia in any order.

Scala
Vector
Easy
10 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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122 more premium HTML/CSS, JavaScript, Scala, 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,   Prefix,   Max Sum,   Launch Time,   Function Wrapper,   Link,   Log Parser,   Unique Numbers,   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,   Language Teaching,   Weighted Average,   Numbers To Text,   Read First Line,   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
  • Element Spacing
  • Flexbox
  • Positioning
  • Fonts
  • Elements and Attributes
  • HTML5
  • Animation
  • Forms
  • Hyperlink
  • IFrame
  • Scala
  • Lazy Evaluation
  • LazyList
  • Algorithmic Thinking
  • Timing Events
  • Exceptions
  • Serialization
  • XML
  • Dictionary
  • Ajax
  • HTTP
  • Promise
  • Arrays
  • CSS Advanced
  • Element Size
  • JSON
  • Pagination
  • Sorting
  • 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
  • Inheritance
  • OOP
  • Arithmetic
  • Content Manipulation
  • DOM Manipulation
  • Iteration
  • Attribute Manipulation
  • Recursion
  • ECMAScript 2015
  • Asynchronous Calls
  • Callback
  • Regex
  • Monkey Patching

For job roles

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

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