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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.
for those still interested: 8, 2, 4, 6 are obviously numbers on the keypad on the keyboard. Like, literally, if you look at the right-hand-side of the full-sized keyboard, these four numbers have arrows printed on them: 8 is up, 2 is down, 4 is left and 6 is right.
In this case it would only be a shallow copy.
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Honestly, I absolutely love the trick with 28th test and its solution of
450010.0000000000000000109731687601401817059439248031553312648...which brings evenDoublenumber type to its knees...Do not forget about memory consumption - it basically makes a copy of the whole linked list.