有人可以提供一个关于如何在 Ruby 中使用 switch case 来表示变量的示例吗?
我假设你指的是案例/时间。
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
or
puts case a_variable
when 1
"it was 1"
when 2
"it was 2"
else
"it was something else"
end
EDIT
也许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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