> I think what Jon was referring to is a feature of Scala more like > Jay's 'scut' macro - you can implicitly create a function by inserting > an _. For example: > > _ + 1 in scala is the same as (lambda (x) (+ x 1))
It just seemed like fate that I was reading this thread, whilst simulatanesouly stumbling across this page on the Internet, [SOURCE: http://wcp.sdf-eu.org/software/index.html] [BEGIN QUOTE] Some syntactic sugar for Scsh (or Scheme48). One of the features in the wish list of Arc that I found cool was the square bracket sexp that expands to a single argument lambda expression. So that one can do things like: (map [/ _ 2] '(2 4 6 8 10)) (cond ((regexp-exec re str) => [match:substring _ 1]) ...) instead of (map (lambda (x) (/ x 2)) '(2 4 6 8 10)) (cond ((regexp-exec re str) => (lambda (m) (match:substring m 1))) ...) Disclaimer: I am not advocating Perl-ish syntactic crypticism. This has been written just as a funny exercise in Scsh hacking. Here is a less heretic approach for those using Emacs: (defun lisp-insert-lambda () "Insert lambda form at point asking for variables." (interactive) (insert "(lambda (" (read-string "Variables: ") ") ") (save-excursion (insert ")"))) (add-hook 'scheme-mode-hook '(lambda () (local-set-key "\C-cl" 'lisp-insert-lambda))) [END QUOTE] Horace. _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
