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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 is using a filter operation. If he was using the map then you would be correct, the ' would be replaced with nothing and his test would fail. But the filter only checks the condition, it does not modify the input.
Because ' or ''' is invalid.