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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.
Oh, true. The question was has anybody else seen the same problem: the function returns an empty string here, but it works in vscode
onlyDuplicates('abccdefee'): expected '' to equal 'cceee'
running the same code in VSCode seems to filter ok
can't figure out what went wrong O_o
loved this kata, so much fun <3