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如何在Ruby中编写switch语句？ 21个答案

---

我假设你参考case / when。

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

要么

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的东西，但是可以非常有用的是，您可以在case语句中使用正则表达式。

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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