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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.
Do you mean one of the solutions in Solutions section or a solution you came up with? If it is the later, that's expected if your code is not fast enough.
Why are you returning
this.l[i]in the middle of your loop?Also, note that you have a typo. Should be
l.length, notl.lenght.