Scala Bootcamp 2021 Homeworks

This repo contains 22 homeworks for Scala Bootcamp 2021

The schedule can be found here: https://github.com/evolution-gaming/scala-bootcamp/blob/bfb1594afa73909f486e1f59f918a6186856b3e7/Schedule.md

IMO most interesting are: 24, 18, 19, 21. But you can look at any below.

Contents

Number/Url	Lecture Topic	Homework Title
01	Introduction and basic Scala Syntax (types, functions, parametric polymorphism)	Least Common Multiple & Greatest Common Division
02	Classes & Traits and some Control Structures: if-else, pattern matching	Areas and Shapes
03	Control Structures: recursion, map, flatMap, filter, for-comprehensions	Calculator
04	Data Structures ([im]mutable, Array, List, Map, tuples)	Number of small exercises
05	Functions ([im]pure, total/partial) & Algebraic Data Types - role in functional design, using them	Poker
06	SBT, single- vs multi-module projects	bulkySources sbt plugin
08	Implicits	Number of small exercises
10	HKT & Type Classes	Homemade JSON Encoder/Decoder & Mutable Bounded Cache
11	Categories (HKT + implicits coding practice)	Categories
12	Error Handling - Option, Either, Try, Validated, encoding errors as ADTs	Payment Card Validator
13	Processing JSON using Circe. Custom coders and decoders	NBA API Parser
14	Unit Testing	Improved Calculator 02
15	Cats Core Intro. Monad Transformers	Number of small exercises
17	Asynchronous Programming - JVM threads, Futures & Promises, synchronized, Atomic	Server Name Extractor
18	Cats Effect: IO	IO implementation with Declarative encoding
19	Cats Effect: Resource, ContextShift, Fiber	Min Hash Calculator
20	Unit Testing 2: Mocks, Compiler Testing, Parametric Reasoning	Property-based tests training
21	Shared State in FP: Ref, Deferred, Semaphore, MVar	Concurrent cache with expiration
23	Http with http4s	Guessing Game
24	WebSocket with http4s	Improved Guessing Game 23
26	Working with Databases from Scala: JDBC, Slick, Doobie	Book Server
27	Akka - Actors and other Akka features	Binary Tree

Structure

Each homework is numbered (01, 02 etc.). Inside the numbered folder you may find two folders: fsharp and scala. The former contains implementation of a task written with F# and the latter - with Scala.

How to run F# (for curious Scala users)

First, you need to install .NET. That is very simple - just find your OS and lines to execute here. Then you need to install Visual Studio Code, and Ionide plugin for it.

In case a task is written as script(s), you will see fsx files which you can run the following ways:

• Open folder with scripts in VS Code. Click Ctrl + A, and then Alt + Enter , which sends the selected text into REPL
• Or run dotnet fsi scriptname.fsx in console

Here is video example which shows both of those options: https://youtu.be/AyCYXAOFoto

If you have any questions about how to use REPL, or have problems with .net/vscode/ionide installation - let me know.

Also, you may want to read a very short F# overview. I expect it to take 30 - 60 mins at max for Scala users:

1. https://livebook.manning.com/book/concurrency-in-dot-net/appendix-a
2. https://livebook.manning.com/book/concurrency-in-dot-net/appendix-b