From: Bernd Burnt <djbearhand@...>
Date: 2007-07-13T20:39:46+09:00
Subject: Loop over an array that changes the elements

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?

Thx a lot!

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