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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.
This is composition, not concatenation. There are two contexts where you can talk about concatenating functions but neither really make sense in javascript (reader monoid and endomorphism monoid).
Is there any real difference between using
sliceandsubstringhere?This comment is hidden because it contains spoiler information about the solution