scala tuple unpacking

scala parameters tuples
scout picture scout · Aug 25, 2010 · Viewed 34.2k times · Source

I know this question has come up many times in different ways. But it is still not clear to me. Is there a way to achieve the following.

def foo(a:Int, b:Int) = {}

foo(a,b) //right way to invoke foo

foo(getParams) // is there a way to get this working without explicitly unpacking the tuple??

def getParams = {
   //Some calculations
   (a,b)  //where a & b are Int
}

Answer

Dave Griffith picture Dave Griffith · Aug 25, 2010

It's a two step procedure. First turn foo into a function, then call tupled on it to make it a function of a tuple.

(foo _).tupled(getParams)

Related questions

Function parameter types and =>

What exactly that declaration of method parameter means: def myFunc(param: => Int) = param What is meaning of => in upper definition?

Read More
Good example of implicit parameter in Scala?

So far implicit parameters in Scala do not look good for me -- it is too close to global variables, however since Scala seems like rather strict language I start doubting in my own opinion :-). Question: could you show …

Read More
In scala can I pass repeated parameters to other methods?

Here is something I can do in java, take the results of a repeated parameter and pass it to another method: public void foo(String ... args){bar(args);} public void bar(String ... args){System.out.println("count="+args.length);} In …

Read More