map-bind

An embarassingly trivial (but crucial) visual macro in Quicklisp.

map-bind is a macro that allows visual grouping of variables with their corresponding values (not necessarily 1:1) in calls to mapping operators when using an inline lambda. It does so in a way that automatically supports virtually every existing and future mapping operator, all lambda list keywords and funcall/apply/multiple-value-call variations.

It does all this with a surprisingly simple implementation!

Here's an example designed to show many features at once:
(color key: prologue arguments values lambda-body)

(map-bind (multiple-value-call #'map 'vector)
    ((symbol #(a b c))
     (number '(1 2 3))
     ((&rest others &key &allow-other-keys) (values '(d e f) #(4 5 6)))
     ((&aux (plus-ten (+ number 10)))))
  (list (1- number) symbol plus-ten (reverse others)))
==
(multiple-value-call #'map 'vector
                     (lambda (symbol number
                              &rest others &key &allow-other-keys
                              &aux (plus-ten (+ number 10)))
                       (list (1- number) symbol plus-ten (reverse others)))
                     #(a b c)
                     '(1 2 3)
                     (values '(d e f) #(4 5 6)))
=>
#((0 A 11 (4 D)) (1 B 12 (5 E)) (2 C 13 (6 F)))

To use map-bind, simply (:import-from #:map-bind #:map-bind). Don't (:use)!