Loading collection data...
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.
This doesn't remove the lowest index, does it?
I've seen people use ~~ a lot with array filter. Not really sure if this is the correct place to ask this, but, what does '~~' do exactly?
Duplicate.
I created a fiddle with some tests and they all work, but when I post the code here it returns and undefined error.