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並前往https://www.codecademy.com/learn/learn-ruby/modules/learn-ruby-arrays-and-hashes-u/cheatsheet

Learn Ruby: Arrays and Hashes Cheatsheet - Codecademy

In Ruby, a hash is a collection of key-value pairs. A hash is denoted by a set of curly braces ( {} ) which contains key-value pairs separated by commas.

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