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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
In Python, the Compiler class has 2 pass1 method and no pass2 method.
Same for PHP, I expected to return a JSON string from pass1, but an array was expected.
Parameters are in the wrong order in PHPUnit tests: assertEquals takes $expected then $actual. So failure messages are missleading.
It's clever and short code have some advantages, but this is certainly not Best Practices. I don't understand why it has been voted as it.