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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.
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It changes exactly as you change the input. Think about it like it's the same instance of an object.
I'll tell you why that matters. The tests are written that way. They allow your function to run first, and then they do solve the problem on the data themselves. If you mutate the input, their solver takes invalid input, thus gives invalid result. It's a bad test, becacuse it's easy to make it pass every time without solving the problem, but hey! We've got what we've got.
I did. And probably that's the reason.
I did it on purpose, knowing it's a bad thing, but that never was a problem so far. I guess I'm learning on my mistakes.
You are right.
I've got a weird error with random tests. For all of them it wants me to return just the last step, and not the whole path. Example:
Expected: ['R30'], instead got: ['L7', 'D1', 'R9', 'D1', 'L25', 'D1', 'R13', 'D1', 'L21', 'D1', 'R3', 'D1', 'R22', 'D1', 'R4', 'D1', 'L10', 'D1', 'R15', 'D1', 'L4', 'D1', 'L5', 'D1', 'L21', 'D1', 'R24', 'D1', 'L14', 'D1', 'R19', 'D1', 'R4', 'D1', 'L27', 'D1', 'L13', 'D1', 'R10', 'D1', 'R1', 'D1', 'R29', 'D1', 'L7', 'D1', 'L1', 'D1', 'L17', 'D1', 'R6', 'D1', 'R5', 'D1', 'R4', 'D1', 'L13', 'D1', 'L4', 'D1', 'L5', 'D1', 'L10', 'D1', 'R20', 'D1', 'R23', 'D1', 'L33', 'D1', 'R17', 'D1', 'L4', 'D1', 'L5', 'D1', 'R4', 'D1', 'R18', 'D1', 'L24', 'D1', 'R26', 'D1', 'L18', 'D1', 'L6', 'D1', 'L17', 'D1', 'R31', 'D1', 'R11', 'D1', 'L40', 'D1', 'R37', 'D1', 'L17', 'D1', 'R16', 'D1', 'R3', 'D1', 'L8', 'D1', 'R7', 'D1', 'L28', 'D1', 'R8', 'D1', 'L13', 'D1', 'L8', 'D1', 'R27', 'D1', 'L23', 'D1', 'R9', 'D1', 'L7', 'D1', 'R35', 'D1', 'L28', 'D1', 'L5', 'D1', 'R16', 'D1', 'L9', 'D1', 'R14', 'D1', 'R8', 'D1', 'L27', 'D1', 'R7', 'D1', 'R19', 'D1', 'L14', 'D1', 'R9', 'D1', 'R4', 'D1', 'L8', 'D1', 'R11', 'D1', 'L7', 'D1', 'L6', 'D1', 'L7', 'D1', 'L4', 'D1', 'R28', 'D1', 'L6', 'D1', 'L35', 'D1', 'R17', 'D1', 'L20', 'D1', 'R25', 'D1', 'R21', 'D1', 'L15', 'D1', 'L6', 'D1', 'L9', 'D1', 'R25', 'D1', 'L5', 'D1', 'L3', 'D1', 'L9', 'D1', 'L20', 'D1', 'L4', 'D1', 'R13', 'D1', 'L12', 'D1', 'R15', 'D1', 'R27', 'D1', 'L9', 'D1', 'L19', 'D1', 'R31', 'D1', 'L16', 'D1', 'L21', 'D1', 'R27', 'D1', 'L31', 'D1', 'L1', 'D1', 'R18', 'D1', 'L6', 'D1', 'R30']