Tuple

Tuple is an ordered collection of elements. Elements can be of any type. The tuple can contain from 2 to 22 elements.

The tuple is used similarly to the structure containing fields _1, _2, etc., where the number of fields is equal to the number of elements of the tuple.

For weight restrictions, see the Data Weight article.

Examples

let x = (42, "waves", true)
x._2

Result: "waves"

let (a, b, c) = x
c

Result: true

Tuple As Function Argument

func foo(a: (Boolean, String)) = {
   a._1.toString() + "_" + a._2
}

foo((true,"waves"))

Result: "true_waves"

Tuple inside match ... case

You can use match ... case to match elements of a tuple with data types or with specific values.

Examples:

match (42, "waves") {
   case (Int, String) => true
   case _ => false
}

Result: true

match (42, "waves") {
   case (x: Int, _) => x == 42
   case _ => false
}

Result: true

match (42, "waves") {
   case (0, y: String) => throw("Something went wrong")
   case (42, y: String) => y
   case _ => false
}

Result: "waves"