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Created Apr 6, 2016
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# 配列
a = ['banana', 'strawberry', 'apple']
# 一番文字列の長いものを返す
a.max_by { |x| x.length } # strawberry
# 引数に個数を指定できる。
a.max_by(2) { |x| x.length } # [strawberry, banana]
# ちなみに、評価式はもちらん以下の書式でもOK
a.max_by &:length # strawberry
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