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?

user_9297144 · Answer

Starting in Scala 3, parameter untupling has been extended, allowing such a syntax:

// val tuples = List((1, "Two"), (3, "Four"))
tuples.map(_.toString + _)
// List[String] = List("1Two", "3Four")

where each _ refers in order to the associated tuple part.

user_102140 · Answer

I think for comprehension is the most natural solution here:

for ((e1, e2) <- arrayOfTuples) yield {
  e1.toString + e2
}