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並前往https://blog.arkency.com/2017/07/nil-empty-blank-ruby-rails-difference/

nil?, empty?, blank? in Ruby on Rails - what's the difference ...

new do |y| a = b = 1 loop do y << a a, b = b, a + b end end fib.empty? # NoMethodError: undefined method `empty?' for #<Enumerator: It can also ...

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