From: Ryan Davis <ryand-ruby@...>
Date: 2006-10-11T18:10:46+09:00
Subject: Re: [ ruby-Bugs-6090 ] Loop over array.delete breaks at first hit


On Oct 10, 2006, at 10:28 PM, ville.mattila@stonesoft.com wrote:

>> Modifying iterating array inside the loop may fail.  Do it with your
>> own risk.  Checking it may hinder the performance.  As you've found
>> out by yourself, delete_if is your friend for the purpose.  It's
>> shorter, faster, and more convenient.
>
>   This rule seems to belong "the principle of the most surprise  
> category".
>   Is this documented somewhere?

In every good data structures book out there, the smalltalk style  
guide, c2.com... all over

Destructive iteration of collections is simply a Bad Thing�. Just  
don't do it.

P.S. rename is_foo to foo?