let-alist

let-alist is an autoloaded Lisp macro in `let-alist.el'.

(let-alist ALIST &rest BODY)

Let-bind dotted symbols to their cdrs in ALIST and execute BODY.
Dotted symbol is any symbol starting with a `.'. Only those present
in BODY are let-bound and this search is done at compile time.

For instance, the following code

(let-alist alist
(if (and .title .body)
.body
.site
.site.contents))

essentially expands to

(let ((.title (cdr (assq 'title alist)))
(.body (cdr (assq 'body alist)))
(.site (cdr (assq 'site alist)))
(.site.contents (cdr (assq 'contents (cdr (assq 'site alist))))))
(if (and .title .body)
.body
.site
.site.contents))

If you nest `let-alist' invocations, the inner one can't access
the variables of the outer one. You can, however, access alists
inside the original alist by using dots inside the symbol, as
displayed in the example above.