Scala return type for tuple-functions

function scala types return tuples
Felix picture Felix · Apr 30, 2010 · Viewed 39.2k times · Source

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).

Answer

oxbow_lakes picture oxbow_lakes · Apr 30, 2010 
def foo : (Int, String, String) = (1, "Hello", "World")

The compiler will interpret the type (Int, String, String) as a Tuple3[Int, String, String]

Related questions

Difference between method and function in Scala

I read Scala Functions (part of Another tour of Scala). In that post he stated: Methods and functions are not the same thing But he didn't explain anything about it. What was he trying to say?

Read More
How to profile methods in Scala?

What is a standard way of profiling Scala method calls? What I need are hooks around a method, using which I can use to start and stop Timers. In Java I use aspect programming, aspectJ, to define the methods to …

Read More
What is "lifting" in Scala?

Sometimes when I read articles in the Scala ecosystem I read the term "lifting" / "lifted". Unfortunately, it is not explained what that exactly means. I did some research, and it seems that lifting has something to do with functional values …

Read More