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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.
TIL about preg_match_all and how its return value is the number of matches.
Big plus for ES2015 syntax here. Super clean & clever solution
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Didn't know about
localeCompare(), and subtracting the sums is lovely shorthand. I went a bit ternary mad...This comment is hidden because it contains spoiler information about the solution