From: Brian Candler <b.candler@...>
Date: 2010-08-01T20:21:50+09:00
Subject: Re: each method

Maurizio De Santis wrote:
> Amir Ebrahimifard wrote:
>> Hi
>> What can I do to can apply some change to an array for always ? ( I want
>> to use iterator and each method and apply some change in an array )
> 
> if I understood the question:
> 
> array.collect! {|item| block } → array
> array.map! {|item| block } → array
> 
> Invokes the block once for each element of self, replacing the element 
> with the value returned by block. See also Enumerable#collect.
> 
>    a = [ "a", "b", "c", "d" ]
>    a.collect! {|x| x + "!" }
>    a             #=>  [ "a!", "b!", "c!", "d!" ]

Another option, if you know the contents are all Strings or Arrays, is 
to use replace:

a.each { |x| x.replace(x+"!") }

It's different because it modifies the string objects themselves 
(leaving the Array pointing to the same string objects)
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