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並前往https://blog.saeloun.com/2020/02/26/ruby-hash-transform_keys-now-accepts-a-hash-that-maps-existing-keys-to-new-keys

Ruby Hash#transform_keys now accepts a hash that maps ...

Before Ruby 2.8. These methods require a block that is used to transform all the keys of the hash. Example. 2.6.5 : ...

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