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From: Amir Ebrahimifard on 31 Jul 2010 18:12
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 )
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From: Maurizio De Santis on 31 Jul 2010 21:30
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!" ]

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From: Brian Candler on 1 Aug 2010 07:21
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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