['a', nil, '', 'b'].compact.reject(&:empty?)
=> ["a", "b"]
['a', nil, '', 'b'].compact.delete_if(&:empty?)
=> ["a", "b"]
なにかで便利メソッドが提供されてる気もする...
ActiveSupportにString#blank?があった。
['a', nil, '', 'b'].reject(&:blank?)
=> ["a", "b"]
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