python の range みたいな。(yield の練習)

range.rb

#! /usr/bin/env ruby -Ku
# -*- coding:utf-8 -*-

def range(s, e, jump=1)
  (s...e).step(jump) do |i|
    yield i
  end
end

# test
range(1, 10, 2) do |i|
  i # => 1, 3, 5, 7, 9
end

range(1, 10) do |i|
  i # => 1, 2, 3, 4, 5, 6, 7, 8, 9
end