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並前往https://batsov.com/articles/2014/02/17/the-elements-of-style-in-ruby-number-13-length-vs-size-vs-count/

The Elements of Style in Ruby #13: length vs size vs count

Let me help with this choice. length is a method that's not part of Enumerable - it's part of a concrete class (like String or Array ) ...

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