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Iterable

inherits Object

Functions as an abstract class in other languages, where it has only minimal functionality and relies on the concrete implementation to provide the basic methods.

methods

• contains?(value) (abstract) returns true if the value is contained in the iterable
• empty?() (abstract) returns true if the iterable has no items
• iterator() (abstract) returns an Iterator
• min() returns the minimum value as determined by the < operator
• max() returns the maximum value as determined by the < operator

Iterator

inherits Object

This is just an interface, but shows what should be returned by the iterator method of Iterable

methods

• has_next?() (abstract) returns true if there is another item in the sequence
• get_next() (abstract) returns the next item in the sequence