The partition method calls the given block for each element in the collection, and separates them into items that returned true, and those that didn't. It returns the two arrays.
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Pet Inventory
pet_lists = inventory.partition{|pet| pet.legs == 4}
# pets with exactly four legs:
pet_lists[0].map(&:name)
#=> ["dog", "cat"]
# pets without exactly four legs:
pet_lists[1].map(&:name)
#=> ["fish", "scorpion", "beetle", "monkey", "rock"]
pet_lists = inventory.partition(&:low_inventory?)
# pets with low inventory:
pet_lists[0].map(&:name)
#=> ["cat", "scorpion", "monkey", "rock"]
# pets with plenty of inventory:
pet_lists[1].map(&:name)
#=> ["dog", "fish", "beetle"]