Loading collection data...
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.
like break after missingLetter = arra[i] + 1; ?
You are watching all array's elements, but you only need to see elements until you find the missing one.
If the array had had 1000 elements and the missing one was found in the 1st iteration, you would be doing an extra effort.
Use a boolean or similar :D.