Scala return type for tuple

I want to make a scala function which returns a scala tuple.

I can do a function like this:

def foo = (1,"hello","world")

and this will work fine, but now I want to tell the compiler what I expect to be returned from the function instead of using the built in type inference (after all, I have no idea what a (1,"hello","world") is).

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def foo : (Int, String, String) = (1, "Hello", "World")

编译器会将类型(Int, String, String)为Tuple3[Int, String, String]

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另外，如果您厌倦了写入（Int，String，String），则可以创建一个类型别名

type HelloWorld = (Int,String,String)
...

def foo : HelloWorld = (1, "Hello", "World")
/// and even this is you want to make it more OOish
def bar : HelloWorld = HelloWorld(1, "Hello", "World")

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