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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.
indexOf on the alphabet array is awesome, love how concise it is! I picked this for best practice because you commented your code, in addition to writing legible code in the first place.
Sorry to nitpick, but doesn't str need one character at the beginning? As written, str.indexOf('a') = 0, but the instructions specify a = 1.
Nice and concise. This solution returns the correct answer if input is valid. However, per instructions invalid input should return 0. This solution throws an error on non-int arguments.
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