A Generalization of Jumps and Labels

This paper describes a new language feature that is a hybrid of labels and procedures. It is closely related to jumping out of a functional subroutine, and includes conventional labels and jumping as a special, but probably not most useful, case. It is independent of assignment, i.e., it can be added to a “purely-functional” (“non-imperative”) system (such as lisp without pseudo-functions or program feature). Experiments in purely functional programming suggest that its main use will be in success/failure situations, and failure actions. This innovation is incorporated in the projected experimental system, iswim.

• Type: Journal
• Year: 1998
• Where: LISP
• Authors: Peter J. Landin
• Keywords: Conventional Labels, Failure Actions, LISP 1998, Purely Functional