From: Joshua Chia <joshchia@...>
Date: 2007-08-04T02:38:52+09:00
Subject: Running multiple closures per iteration

Is there a way to run more than one closure per iteration through a
collection?  For example, if I want to do the following two things, can
I combine them so that I only end up with one pass over the collection,
without doing a manual for loop?

o = a.select {|x| x >= 0}
p = a.inject(0) {|s, x| s += x}

Such a combination is useful when iterating through a collection is
expensive, e.g. on a large file on a slow disk.
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