Comments on: Pushing to Lists http://stuartsierra.com/2006/06/06/pushing-to-lists From programming to everything else Thu, 17 May 2012 15:24:23 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: stuart http://stuartsierra.com/2006/06/06/pushing-to-lists/comment-page-1#comment-28 stuart Mon, 12 Jun 2006 14:14:09 +0000 http://stuartsierra.com/?p=25#comment-28 Zach B.: <em>"Counting instructions to see how you’re doing is a little premature at this point."</em> Definitely premature, but fun nonetheless. :) Zach B.: “Counting instructions to see how you’re doing is a little premature at this point.”

Definitely premature, but fun nonetheless. :)

]]> By: Zach Beane http://stuartsierra.com/2006/06/06/pushing-to-lists/comment-page-1#comment-27 Zach Beane Mon, 12 Jun 2006 14:00:14 +0000 http://stuartsierra.com/?p=25#comment-27 The result of destructively modifying literal data like '(A B C) is undefined. Don't do it. In most of the cases when you think you need to push something on the end of a list, you actually don't; PUSH+NREVERSE is often more suitable. When you really do need to push things on the end of a list, keeping a pointer to the tail of the list is handy. Counting instructions to see how you're doing is a little premature at this point. The result of destructively modifying literal data like ‘(A B C) is undefined. Don’t do it.

In most of the cases when you think you need to push something on the end of a list, you actually don’t; PUSH+NREVERSE is often more suitable. When you really do need to push things on the end of a list, keeping a pointer to the tail of the list is handy.

Counting instructions to see how you’re doing is a little premature at this point.

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