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Article contents:== Outdated egg! This is an egg for CHICKEN 3, the unsupported old release. You're almost certainly looking for [[/eggref/4/combinators|the CHICKEN 4 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-4.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] [[toc:]] == Introduction Combinators grab-bag. == Usage (require-extension combinators) == Documentation ==== group/key [procedure] (group/key KEYPROC LYST [EQUALITY equal?]) Groups a {{LYST}} of elements by some key attribute. Uses the single-argument {{KEYPROC}} to retrieve key values & the {{EQUALITY}} procedure to compare them. Returns a list of grouped elements. ==== make-</key [procedure] (make-</key KEYPROC [LESS-THAN <]) Returns a two-argument procedure that uses the single-argument {{KEYPROC}} to retrieve key values & the two-argument {{LESS-THAN}} procedure to compare them. == Examples <enscript highlight=scheme> (group/key identity '(1 2 3 3 4 4 4)) ;=> ((1) (2) (3 3) (4 4 4)) (group/key car '((a 1) (a 2) (b 1))) ;=> '(((a 1) (a 2)) ((b 1))) (sort '(("a" . 1) ("z" . 3) ("b" . 2)) (make-</key first string-ci<?)) ;=> (("a" . 1) ("b" . 2) ("z" . 3)) </enscript> == Notes == Bugs and Limitations == Author * Graham Fawcett * Kon Lovett == License Public Domain. == Requirements == Version history ; 1.0 : Hello Description of your changes:

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What do you get when you multiply 2 by 8?