Ruby on Rails Switch

Question

有人可以提供一個關於如何在Ruby中爲變量使用switch case的例子嗎？

Answer 1

我假設你指的是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 

或

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

編輯

東西也許不是每個人都知道，但什麼是非常有用的是，你可以在一個case語句使用正則表達式。

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}"