From: Josselin <josselin@...>
Date: 2007-09-24T19:20:04+09:00
Subject: Re: Nested array filling bad..

On 2007-09-23 16:23:21 +0200, 7stud -- <dolgun@excite.com> said:

> Josselin wrote:
>> 
>> what's wrong with my array def ?
>> 
> 
> --------------------------------------- Array::new
>      Array.new(size=0, obj=nil)
>      Array.new(array)
>      Array.new(size) {|index| block }
> -------------------------------------------------------
> Returns a new array. In the first form, the new array is empty. In
> the second it is created with _size_ copies of _obj_ (that is,
> _size_ references to the same _obj_).
> 
> So, you are essentially doing this:
> 
> a = Array.new
> b = a
> p a, b
> 
> --output:--
> []
> []
> 
> 
> a << 1
> p a, b
> 
> --output:--
> 
> [1]
> [1]
> 
> 
> Try this instead:
> 
> arr = Array.new(7) {Array.new}
> arr[0] << 0
> arr[1] << 1
> 
> p arr
> 
> --output:--
> [[0], [1], [], [], [], [], []]

thanks a lot.. got it