Ruby Language Iteration Implementation in a class
Example
Enumerable is the most popular module in Ruby. Its purpose is to provide you with iterable methods like map, select, reduce, etc. Classes that use Enumerable include Array, Hash, Range.
To use it, you have to include Enumerable and implement each.
class NaturalNumbers
include Enumerable
def initialize(upper_limit)
@upper_limit = upper_limit
end
def each(&block)
0.upto(@upper_limit).each(&block)
end
end
n = NaturalNumbers.new(6)
n.reduce(:+) # => 21
n.select(&:even?) # => [0, 2, 4, 6]
n.map { |number| number ** 2 } # => [0, 1, 4, 9, 16, 25, 36]
