On Wed, May 26, 2010 at 12:34 PM, Jay McCarthy <jay.mccar...@gmail.com> wrote: > And I would recommend using hash-ref! to save a line.
#lang racket
;; Report each unique line from stdin:
(let ([saw (make-hash)])
(for ([line (in-lines)])
(hash-ref! saw line
(λ () (displayln line)))))
Slick.
--
sam th
sa...@ccs.neu.edu
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