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並前往https://rubymonk.com/learning/books/1-ruby-primer/chapters/10-hashes-in-ruby/lessons/47-hashes-in-and-out

Ruby Primer - Hashes, in and out. - RubyMonk

Every Hash object has two methods: keys and values . The keys method returns an array ... Try getting an array of all the keys in the restaurant_menu hash:.

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