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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.
The one-liner is using built-in methods to do the conversion (
[0, 0, 0, 1]
->["0", "0", "0", "1"]
-->"0001"
-->1
)Whilst yours is doing the mathematical approach.
The code for string replacement is wrong because you intended to replace all substrings with positioning beyond
counter
whilst the correct way is to replace the specified character with respective position.Look closely what happens when they pay you with a 100 dollars bill. Read this too: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution