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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.
check the api docs?
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Not all letters in 'hello' are present in 'hi'; so it's false.
I don't understand where do you think the problem is.
Thank you for your comment anyway.
This is not correct. What if arr[0] is 'hi' and arr[1] is 'hello'?
Edit: this example is not valid