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並前往https://rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/45-more-classes/lessons/108-displaying-objects

2.3 Displaying Objects: puts and p, to_s and inspect - RubyMonk

Did you notice that the output of both p and puts became the same in the above example? This is because if you override to_s for an object, Ruby will treat it ...

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