Tuple Unpacking in Map Operations

Question

I frequently find myself working with Lists, Seqs, and Iterators of Tuples and would like to do something like the following,

val arrayOfTuples = List((1, "Two"), (3, "Four")) arrayOfTuples.map { (e1: Int, e2: String) => e1.toString + e2 } 

However, the compiler never seems to agree with this syntax. Instead, I end up writing,

arrayOfTuples.map {      t =>      val e1 = t._1     val e2 = t._2     e1.toString + e2  } 

Which is just silly. How can I get around this?

Answer 1

A work around is to use case :

arrayOfTuples map {case (e1: Int, e2: String) => e1.toString + e2} 

Answer 2

I like the tupled function; it's both convenient and not least, type safe:

import Function.tupled arrayOfTuples map tupled { (e1, e2) => e1.toString + e2 }