Example code for one of the complexities caused by state as discussed in the DDD Hamburg Meetup Group and based on the ideas from the seminal paper "Out Of The Tar Pit" by Ben Moseley and Peter Marks.
# Clone the repo
$ git clone [email protected]:DDD-Hamburg/complexity-caused-by-state.git
# Install composer and project dependencies
$ make bootstrap
## The experiment
Have a look the `examples` folder to get a grasp of the problem caused by state.
We created different Calculators to solve a very simple calculation problem that leads to common errors.
$ php tool/evaluate_complexity.php
The script will iterate for every Calculator and validate the results.
To be able to fully test every calculator you'll need:
1. Full working environment in Elixir with Phoenix
2. Checkout https://github.com/DDD-Hamburg/complexity-elixir and follow the instructions in the repository to make it work
3. Full working environment in Haskell
4. Checkout https://github.com/DDD-Hamburg/complexity-haskell and follow the instructions in the repository to make it work
The repository provides a Makefile to help you speeding up your development process.
$ make help
bootstrap Install composer
tests Execute test suite and create code coverage report
update Update composer packages