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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

However unlike Array#each , when you iterate over a Hash using each , it passes two values to the block: the key and the value of each element. Let us see how ...

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