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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.
Have thought in this direction, but had this test error:
“expected: java.util.Arrays$ArrayList<[]> but was: java.util.ArrayList<[]>”
Wierd...
In the filter() you can use only the second condition as it covers the first one as well.
Only one detail: use StringBuilder to concatenate. It's much faster.