Enumerator::ArithmeticSequence

        # Enumerator::ArithmeticSequence < Enumerator

(from ruby core)
---
Enumerator::ArithmeticSequence is a subclass of Enumerator, that is a
representation of sequences of numbers with common difference. Instances
of this class can be generated by the Range#step and Numeric#step
methods.

The class can be used for slicing Array (see Array#slice) or custom
collections.
---
# Instance methods:

    ==
    ===
    begin
    each
    end
    eql?
    exclude_end?
    first
    hash
    inspect
    last
    size
    step