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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.
Hi Impulse,
'return key[i]' returns a string, therefore replace this line with:
return Number(keys[i]);
That should do the trick.
Just check if you are returning a number or a string. You should return a number.
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This comment is hidden because it contains spoiler information about the solution