Ruby方法"to_sym"有什么作用? [英] What does the Ruby method 'to_sym' do?

问题描述

to_sym方法有什么作用?它是做什么用的?

What does the to_sym method do? What is it used for?

推荐答案

to_sym将字符串转换为符号.例如，"a".to_sym变为:a.

to_sym converts a string to a symbol. For example, "a".to_sym becomes :a.

它不是特定于Rails的；香草红宝石也有.

It's not specific to Rails; vanilla Ruby has it as well.

在某些版本的Ruby中，符号也可以与Fixnum相互转换.但是来自ruby-lang.org的Ruby 1.9.2-p0中的irb不允许这样做，除非您将自己的to_sym方法添加到Fixnum中.我不确定Rails是否会这样做，但是在任何情况下它似乎都不太有用.

It looks like in some versions of Ruby, a symbol could be converted to and from a Fixnum as well. But irb from Ruby 1.9.2-p0, from ruby-lang.org, doesn't allow that unless you add your own to_sym method to Fixnum. I'm not sure whether Rails does that, but it doesn't seem very useful in any case.

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