https://github.com/binkley/skratch

Kotlin Scratch Code
https://github.com/binkley/skratch

Last synced: 10 months ago
JSON representation

Kotlin Scratch Code

• Host: GitHub
• URL: https://github.com/binkley/skratch
• Owner: binkley
• License: other
• Created: 2017-02-10T16:38:32.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2024-05-02T23:17:24.000Z (over 1 year ago)
• Last Synced: 2025-03-20T10:56:14.351Z (10 months ago)
• Language: Kotlin
• Size: 1.13 MB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

Awesome Lists containing this project

README

          






# Skratch

[![build](https://github.com/binkley/skratch/workflows/build/badge.svg)](https://github.com/binkley/skratch/actions)

[![issues](https://img.shields.io/github/issues/binkley/skratch.svg)](https://github.com/binkley/skratch/issues/)

[![pull requests](https://img.shields.io/github/issues-pr/binkley/skratch.svg)](https://github.com/binkley/skratch/pulls)

[![vulnerabilities](https://snyk.io/test/github/binkley/skratch/badge.svg)](https://snyk.io/test/github/binkley/skratch)

[![license](https://img.shields.io/badge/license-Public%20Domain-blue.svg)](http://unlicense.org/)

Kotlin Scratch Code

## Caveat emptor

This is an scratch, experimental repository.  It might use force push.

## Modules

Drop use of JVM modules. Repeating the same thing 3 times is annoying:

- In the build dependencies

- In `module-info.java`

- In source code imports

## BDD

Two styles of BDD in Kotlin: strings and functions.

- Functions: passes BDD text

  as [function names](./src/main/kotlin/hm/binkley/labs/skratch/bdd/funcs)

- Strings: passes BDD text

  as [strings](./src/main/kotlin/hm/binkley/labs/skratch/bdd/strings)

## Matrix

Modelling the Pauli spin matrices.

## Money

Classic Ward Cunningham example.

### Rethink

Using subtypes for specific currencies is fraught with peril. See:

- https://deque.blog/2017/08/17/a-study-of-4-money-class-designs-featuring-martin-fowler-kent-beck-and-ward-cunningham-implementations/

- https://deque.blog/2017/08/22/a-follow-up-of-the-study-of-4-money-class-designs-why-not-having-currencies-as-type-parameters/

## Building

Gradle was tried out, and found lacking (and painful). Returned to dull yet

reliable Maven.

### Gotchas

* Remember to add the `--enable-preview` flag to the JVM, including when

  running from inside an IDE

* Java heap space failures when tests fail

* `Rational` should extends `Complex` (with 0 imaginary portion), but

  `Complex` uses rational values for its portions. How to untangle?