Returns the index of the last element in the collection that matches the given predicate.
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A closure that takes an element as its argument and returns a Boolean value that indicates whether the passed element represents a match.
The index of the last element in the collection that matches
nil if no elements match.
You can use the predicate to find an element of a type that doesn’t conform to the
Equatable protocol or to find an element that matches particular criteria. This example finds the index of the last name that begins with the letter A:
Complexity: O(n), where n is the length of the collection.