Ruby on Rails Switch


Ruby on Rails Switch

本问题已经有最佳答案，请猛点这里访问。

有人能提供一个关于如何使用ruby中的switch case for variable的例子吗？

我想你指的是案例/时间。

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case a_variable # a_variable is the variable we want to compare
when 1    #compare to 1
  puts"it was 1"
when 2    #compare to 2
  puts"it was 2"
else
  puts"it was something else"
end

或

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puts case a_variable
when 1
 "it was 1"
when 2
 "it was 2"
else
 "it was something else"
end

编辑

可能不是每个人都知道，但非常有用的是，您可以在case语句中使用regexps。

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foo ="1Aheppsdf"

what = case foo
when /^[0-9]/
 "Begins with a number"
when /^[a-zA-Z]/
 "Begins with a letter"
else
 "Begins with something else"
end
puts"String: #{what}"
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