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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.
Thanks! I corrected it
Java translation provided
Java translation created
The test cases seem to be lacking. My original solution would fail if a letter appeared 3 times, yet it passed all the tests. I changed my solution and added the following tests for JavaScript, which failed with my original code.
Test.assertEquals(firstNonRepeatingLetter('abbaabczaz'), 'c');
Test.assertEquals(firstNonRepeatingLetter('zaazzapper'), 'e');
Test.assertEquals(firstNonRepeatingLetter('abbAabcZzaz'), 'c');
Test.assertEquals(firstNonRepeatingLetter('zaazzZxXAaaP3er'), 'P');