#if文をワンライナーで書くには？
str = "is this a book?"
if str.include?("?")
puts "yes, it is."
end
str = "is this a book?"
puts "yes, it is." if str.include("?")
学んだこと
・オブジェクト名.include？（"文字列"とか配列）
・include？は正規表現は使えないっぽい
・三項演算子というものもある
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