You need to sign in or sign up before continuing.×
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.
yes
in according with indexOf docs
"The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present."
it can be found on this mdn link