FizzBuzz, lambda edition

fizzbuzz.rb

#! /usr/bin/env ruby

class FizzBuzz
  attr_reader :limit, :matchers

  DEFAULT_LIMIT = 100

  DEFAULT_MATCHERS = [
   -> x { "Fizz" if (x % 3).zero? },
   -> x { "Buzz" if (x % 5).zero? },
  ]

  def initialize limit=DEFAULT_LIMIT, matchers=DEFAULT_MATCHERS
    raise ArgumentError, "Limit must be a positive integer!" if limit < 1
    @limit = limit
    @matchers = matchers
    self.(1)
  end

  def call i
    return if i > limit
    matches = matchers.map { |p| p.(i) }.compact
    puts matches.empty? ? i.to_s : matches.join
    self.(i+1)
  end

  def self.[] i=nil
    new (i || DEFAULT_LIMIT).to_i
  end

end

def fizzbuzz i=nil
  FizzBuzz[i]
end

fizzbuzz ARGV[0]