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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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Already fixed
How did you solve it? I have it working on node, but not in codewars?
It does unless ES6 tail-call optimization takes effect. In this implementation, it does not take effect, because function call to map is not in tail-call position. See here: http://www.2ality.com/2015/06/tail-call-optimization.html
Does it not create a burden on memory with long list because of recursion and call stack ?
Yes - the function 'map' calls itself with the next node in the list. More info here
Often this works for this problem:
It is not a bug of the kata but a CW bug, report it : Forum -> Bugs.
No reply, resolved until further notice.
What do you mean by pop up?