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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.
It means a number as a number, or a string with a number in it.
There is already an example in the descriptions.
The description is not too clear and the number first rule is broken. There are some tests with a number first expectation, while others have a string first expectation, expecially for specs with Stringed integers.
There is an issue with the test specs. The fourth test has a missing closing bracket ")" at the end.
The description can be better, to show that the expected result should be in alternating manner.