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.
I got this test failed too. I use console.log to print out the input arrays a and b , I found that this failed test ( a was [1,2,2], b was [2], expected [1] ) is caused by wrong input... The test says b is [2], but exactly b is [] from log.