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Rubyでメソッドの引数にnilを渡すと、デフォルト引数は適用されない。

Ruby

Posted at 2019-08-10

タイトルのとおりで初歩的な話ながら、知らなかったのでメモ。

def add_one(num = 10)
  num + 1
end

p add_one(3)  # => 4

p add_one  # => 11

p add_one(nil)  # => undefined method `+' for nil:NilClass (NoMethodError)

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