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Tuple

rascal-0.40.17

Synopsis​

Tuple values.

Syntax​

< Exp₁, Exp₂, ... >

Types​

Exp₁Exp₂...< Exp₁, Exp₂, ... >
T₁T₂...tuple[T₁, T₂, ... ]

Description​

A tuple is a sequence of elements with the following properties:

  • Each element in a tuple (may) have a different type.

  • Each element of a tuple may have a label that can be used to select that element of the tuple.

  • Each tuple is fixed-width, i.e., has the same number of elements.

Tuples are represented by the type tuple[T₁ L₁, T₂ L₂, ...], where T₁, T₂, ... are arbitrary types and L₁, L₂, ... are optional labels.

The following operators are provided for tuples:

Examples​

rascal>tuple[str first, str last, int age] P = <"Jo","Jones",35>;
tuple[str first,str last,int age]: <"Jo","Jones",35>
rascal>P.first;
str: "Jo"
---
Jo
---
rascal>P.first = "Bo";
tuple[str first,str last,int age]: <"Bo","Jones",35>