TUPLE!

Summary

member selection with inert bias

Kind

Fundamental type

A sequence of elements joined by dots, such as obj.field or 1.2.3. Evaluating one picks a member, such as a field of an object.

Historical Rebol’s TUPLE! held only small numbers (as in versions and colors). It is now a general sequence like PATH!, just with dots.

Sequences are immutable. They are not ANY-SERIES?, so they have no position or index, and can’t be changed in place. Elements can still be picked by index or walked with FOR-EACH; to restructure one, convert it to a BLOCK! and back. A sequence has at least two elements, and can’t contain a sequence of the same kind directly.