callables/forwarded_block_scope.rb

tests/_examples/callables/forwarded_block_scope.rb in the metorex repository.

class Walker
  def each_item(&block)
    [1, 2].each(&block)
  end

  def each_pair_of(&block)
    { a: 1 }.each_pair(&block)
  end
end

module Shipping
  RATE = 4

  class Entry
    def initialize(value)
      @value = value
    end

    def to_s = "entry #{@value}"
  end

  def self.collect
    found = []
    Walker.new.each_item { |item| found << Entry.new(item * RATE).to_s }
    Walker.new.each_pair_of { |key, value| found << "#{key} #{value + RATE}" }
    found
  end
end

p(Shipping.collect)

Output:

["entry 4", "entry 8", "a 5"]