ruby - attr_accessor 是否需要在 Ruby 中使用符号作为变量？

Question

我见过的每个 attr_accessor 示例都使用一个符号 (:var) 作为变量。

这是使用 attr_accessor 的要求吗？如果是，为什么？如果不是，为什么这种做法如此普遍？

Answer 1

Module#attr_accessor

attr_accessor(symbol, ...) → nil

attr_accessor(string, ...) → nil (newly introduced in Ruby 2.1)

Defines a named attribute for this module, where the name is symbol.id2name, creating an instance variable (@name) and a corresponding access method to read it. Also creates a method called name= to set the attribute. String arguments are converted to symbols.

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Is this a requirement of using attr_accessor?

不，您可以使用符号和字符串。

阅读此 - Understanding Ruby symbol as method call