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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.
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Use
console.log(str);before your loop and you'll realize why.Map<String, int>seems clear to me. Moreover in case you have a doubt about the output, you should have a look at test cases to see examples. Here it's easy to see you have to return a dictionary/map and not a function.I don't understand what's your problem. Which changes would you suggest to improve the description?