From: 7stud -- <dolgun@...>
Date: 2007-09-23T23:23:21+09:00
Subject: Re: Nested array filling bad..

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], [], [], [], [], []]
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