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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.
He meant which programming language, it's javascript, isn't it?
See the expected and actual result in two rows:
They're not the same.
There's no way we can tell you why without seeing your code. Are you misreading the logs off-by-one? What does the error message say? What language are you working in? Are you returning the value or printing the value?