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並前往http://chrisholtz.com/blog/lets-make-a-ruby-hash-map-method-that-returns-a-hash-instead-of-an-array/

Let's make a Ruby hash map method that returns ... - Chris Holtz

The built-in hash array has a really handy map method. ... Similarly, Ruby hashes also have a map method - it does more or less the same thing.

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