Tuples are user-defined classes composed of named slots. They are the central data type of Factor's object system. Tuple examples
A parsing word defines tuple classes:
For each tuple class, several words are defined, the class word, a class predicate, and accessor words for each slot.
The class word is used for defining methods on the tuple class; it has the same name as the tuple class. The predicate is named name ?
. Initially, no specific words are defined for constructing new instances of the tuple. Constructors must be defined explicitly, and tuple slots are accessed via automatically-generated accessor words. Slot accessors Tuple constructors Tuple subclassing Tuple slot declarations Protocol slots Tuple introspection
Tuple classes can be redefined; this updates existing instances: Tuple redefinition
Tuple literal syntax is documented in Tuple syntax