Kotlin Core

This repository houses several projects developed during Kotlin Core course provided by JetBrains Academy

The projects are developed using Kotlin 2.0 and several additional packages:

1. kotlin-reflect for some metadata manipulation
2. arrow in combination with context parameters
3. kotlinpoet to generate test case data in indigo-card-game
4. junit-jupiter and assertk for unit testing

Projects

All these projects are essentially console applications which communicate with the user in a request-response manner

List is ordered by project completion date

⚖️ unit-converter

A simple app which parsers and converts different types of unit (length, weight and temperature). The core conversion logic is located in Unit.kt

🧮 smart-calculator

An arithmetic calculator which supports main operators [+, -, *, /, ^], calculations in parentheses and variable assignment.

Calculation is based on the Polish Postfix Notation and implemented in Calculator.kt

Expression tokenization and parsing is located in package calculator.parser

🃏 indigo-card-game

A text-only card game with several neat features:

• [2-8] players supported;
• Two kinds of Player: User and Computer;
• Each game can be played by any number of users/computers (as long as the total number of players is correct);
• Fully immutable state with event-based logic: GameEvent.kt

🛠 git-internals

CLI tool which provides several commands to observe git repository content:

• cat-file - display git object's (commit, tree or blob) content with the specified hash
• list-branches - list all repository branches and specify which is the current one
• log - show a full commit history for a specified branch
• commit-tree - show a full git file system tree of a commit with the specified hash

This one is my favorite because it required a lot of reverse engineering, and it helped me to get a better understanding of git internal structure

📠 contacts

A phone book application with several contact types supported.

Implementation is heavily based on Arrow library - Either<E, R>, Ior<E, R>, Raise<Error> types and opted-in Kotlin context parameters.

Also in this project I used Either-returning constructor technique (like here), which I learned about from a great book by Alejandro Serrano Mena: FP Ideas for the Curious Kotliner