Ruby中的枚举 [英] Enums in Ruby

问题描述

在Ruby中实现枚举成语的最佳方式是什么？我正在寻找可以使用（几乎）像Java / C＃枚举的东西。

解决方案

两种方式。符号（：foo 符号）或常量（ FOO 符号）。

如果您想提高可读性，而不用乱码与文字字符串相符，则符号是适当的。

  postal_code [：minnesota] = MN
 postal_code [：new_york] =NY
  

具有重要的基础价值。只需声明一个模块来保存你的常量，然后声明该常量。

 模块Foo 
 BAR = 1 
 BAZ = 2 
 BIZ = 4 
 end 
 
 flags = Foo :: BAR | Foo :: BAZ＃flags = 3 
  

What's the best way to implement the enum idiom in Ruby? I'm looking for something which I can use (almost) like the Java/C# enums.

解决方案

Two ways. Symbols (:foo notation) or constants (FOO notation).

Symbols are appropriate when you want to enhance readability without littering code with literal strings.

postal_code[:minnesota] = "MN"
postal_code[:new_york] = "NY"

Constants are appropriate when you have an underlying value that is important. Just declare a module to hold your constants and then declare the constants within that.

module Foo
  BAR = 1
  BAZ = 2
  BIZ = 4
end

flags = Foo::BAR | Foo::BAZ # flags = 3

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