From: Rick DeNatale <rick.denatale@...>
Date: 2008-09-28T23:01:41+09:00
Subject: Re: How does Array's each method change its elements ?

2008/9/27 Sebastian Hungerecker <sepp2k@googlemail.com>:
> Radosław Bułat wrote:
>> There is also "<<" for integers but it works
>> different and doesn't change objects because of fact that integers are
>> immutable in Ruby.
>
> Well, I would assume that if Integers were mutable, << would still not be a
> mutating method as that would really not make much sense.

I think that the key idea here is that the block argument of each (or
any iterator method for that matter)  can't affect an element of the
collection unless it invokes a mutating method on that element.

The fact that immutable objects like integers don't HAVE any mutating
methods (by definition) is a bit of an aside.

-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/