[racket-dev] Fancy application/automatic anonymous functions

From: Guillaume Marceau (gmarceau at gmail.com)
Date: Sun Jun 5 09:20:32 EDT 2011

On Tue, May 17, 2011 at 3:14 PM, Sam Tobin-Hochstadt <samth at ccs.neu.edu>
> Lots of people have written similar things (`cut' in SRFI 26, Jay's
> `super-cut', etc), but I'd like to move towards using it implicitly.

I use (require (rename-in srfi/26 [cut //])) and that's simple enough for
me. I find the implicit version harder to read. You have to read further to
the right before realizing you are inside a function, and it is easy to

Here are two example from my code of how it looks.

(define common-confusions
  (filter-not all-the-same?
              (map (// sort <> <)
                   (map (// take <> 2) summary)))))

(define (non-whitespace-diff? . strings)
 (define collapsed (map (// regexp-replace* #px"[[:space:]]{2,}" <> " ")
 (not (andmap (// equal? (first collapsed) <>) (rest collapsed))))
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