From: Robert Dober <robert.dober@...>
Date: 2007-07-13T22:00:07+09:00
Subject: Re: Loop over an array that changes the elements

On 7/13/07, benjohn@fysh.org <benjohn@fysh.org> wrote:
> > Hi,
> >
> > I have a rather simple question. I have an array and want to change the
> > elements of the array in a loop. For example in Java, you would write:
> >
> > int[] numbers = {1, 2, 3}
> >
> > for(int i = 0; i < numbers.length; i++)
> > {
> >    numbers[i] = numbers[i] * 2
> > }
> >
> >
> > In Ruby the common way to loop over an array is Array#each
> >
> > But
> >
> > numbers = [1, 2, 3]
> >
> > numbers.each do |num|
> >   num = num * 2
> > end
> >
> > would not change the array itself.
> >
> > Of course, you can write something like
> >
> > for i in 0 .. numbers.length-1 do
> >   numbers[i] = numbers * 2
> > end
> >
> > But this in my eyes is not really the Ruby way. Is there a standard way
> > of doing this?
>
> numbers = numbers.map {|number| numer * 2}
Hmm what about the GC?
>
> Cheers,
>   B
>
>
>


-- 
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Beck