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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.
yes
No, it is actually more confusing than that!
The first time array.pop(0) is executed the array variable is still bound to the input argument.
But after that, the array variable is rebound to a new list, and therefore no longer mutates the input argument.
So, the input array is changed after the function, but only with its first row removed.