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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.
If the resulting array is empty, calling
firstwill yieldnil, which needs to be converted into0. This can be done either by usingto_ior|| 0.Why would .to_i be necessary? The array consists of integers only.
(arr - mixed_arr).first.to_i
(arr - mixed_arr).pop.to_i
Brilliant! nil.to_i==0! I forgot it :(