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File.read('hoge.csv') .split("\n") .sort .uniq .map(&:to_i) .select{|n| (1..100).cover?(n) }
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get(‘/’) { ‘hello!’ }
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2i.class
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irb(main):001:0> 2i.class => Complex
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( 2i * 2i ) < -3
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irb(main):002:0> ( 2i * 2i ) < -3 NoMethodError: undefined method `<' for (-4+0i):Complex from (irb):2 from /Users/hoshino/.rbenv/ versions/2.4.0/bin/irb:11:in `'
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