Tuple types

A tuple type is a parenthesized, comma-separated list of types. 1-ary tuples require a comma after their element type to be disambiguated with a parenthesized type.

A tuple type has a number of fields equal to the length of the list of types. This number of fields determines the arity of the tuple. A tuple with n fields is called an n-ary tuple. For example, a tuple with 2 fields is a 2-ary tuple.

The tuple type with no fields () is also called the Unit type


() // Unit type.
(u32, u256)
(felt252, u16, Option<u8>)

Values of this type are constructed using a tuple expressions. Tuples can be deconstructed using patterns.