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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 should return true not false. your is 'false' which wrong you need to return 'true'. use >= not *
filter give only the matching chars then length gives how many chars are left. if total matching chars are 5, filter keeps 5 chars and remove all not matching chars, then length give the total length of remaining chars.
did exactly same!
Great Kata.
i did same.