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FizzBuzz in ruby 2.0
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#!/usr/bin/env ruby | |
class FizzBuzz | |
include Enumerable | |
def label(n) | |
@label_definitions.lazy.select {|label, denominator| | |
n % denominator == 0 | |
}.map(&:first).first | |
end | |
def fizzbuzz(n) | |
label(n) || n | |
end | |
def initialize(label_definitions = {fizzbuzz: 15, fizz: 3, buzz: 5}) | |
@label_definitions = label_definitions | |
end | |
def each | |
(1..Float::INFINITY).lazy.each {|n| | |
yield fizzbuzz(n) | |
} | |
end | |
end | |
limit, fizz, buzz = ARGV.map(&:to_i) | |
limit ||= 100 | |
fizz ||= 3 | |
buzz ||= 5 | |
puts FizzBuzz.new(fizzbuzz: fizz.lcm(buzz), fizz: fizz, buzz: buzz).take(limit) |
fizz * buzz
これだとfizz = 4、buzz = 6のときなど、最小公倍数12のときにfizzbuzzが出ないんじゃね?と突っ込まれたので
fizz.lcm(buzz)
に直しました。
キーワード引数使って
def initialize(fizz: 3, buzz: 5)
@label_definitions = {fizzbuzz: fizz.lcm(buzz), fizz: fizz, buzz: buzz}
end
してもいいかもしれないですね。
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のような感じで
label: x
と書いておくとxでnが割り切れた時はlabel、そうでないときはxを返してくれるソレです。FizzBuzzクラスといいつつやってることちょっと違うしアレかなと思いつつ書いた。