Ruby：是值列表中的字符串

时间：2022-03-04 22:52:33

Newbie Ruby question:

新手Ruby问题：

I'm currently writing:

我现在正在写：

if mystring == "valueA" or mystring == "ValueB" or mystring == "ValueC"

is there a neater way of doing this?

这样做有一个更简洁的方法吗？

3 个解决方案

#1

There are two ways:

有两种方法：

RegEx:

正则表达式：

if mystring =~ /^value(A|B|C)$/ # Use /\Avalue(A|B|C)\Z/ here instead 
   # do something               # to escape new lines
end

Or, more explicitly,

或者，更明确地说，

if ["valueA", "valueB", "valueC"].include?(mystring)
   # do something
end

Hope that helps!

希望有所帮助！

#2

How 'bout

怎么样

if %w(valueA valueB valueC).include?(mystring)
  # do something
end

#3

Presuming you'd want to extend this functionality with other match groups, you could also use case:

假设您想要将此功能扩展到其他匹配组，您还可以使用大小写：

case mystring
when "valueA", "valueB", "valueC" then
 #do_something
when "value1", "value2", "value3" then
 #do_something else
else
 #do_a_third_thing
end

#1