```Only correcting myself
none of the ifs with minus operations

On 23 November 2013 00:23, Rafael Moraes <rafaelmoraesdefreitas / gmail.com>w=
rote:

> I know nothing about tests, I am not able to help you in this matter
>
> but I can tell you the following:
>
>
>  if !esperado[i-1][j].nil?              esperado[i - 1][j] =3D "X"       =
=3D "X"            end            if !esperado[i][j-1].nil?              e=
esperado[i][j+1] =3D "X"          end
>
>
> None of these if will evaluate to false, lets say you are at position [0,=
0] and apply the [i - 1][j]
>
> it will become [-1, 0]
>
> and index -1 is the last index of an array
>
> example:
>
> irb(main):001:0> array =3D ['first', 'second', 'third']
> =3D> ["first", "second", "third"]
> irb(main):002:0> array[0]
> =3D> "first"
> irb(main):003:0> array[-1]
> =3D> "third"
>
>
>
> On 21 November 2013 17:52, Chris Hulan <chris.hulan / gmail.com> wrote:
>
>> looking at the code, you are adding 'X" to the adjacent cells when an 'X=
'
>> is found in a given cell,
>> but what is the expected behaviour when a 'X' is found on an edge?
>>
>>
>> On Thu, Nov 21, 2013 at 2:30 PM, Ronny Amarante <lists / ruby-forum.com>wr=
ote:
>>
>>> Hi guys, i don't understand why this happen. Exist another way to use
>>> math expression in arrays?
>>>
>>> expected: [[" ", "X", "X", "X", " ", "X", "X", "X"], ["X", "X", "X",
>>> "X", " ", " ", "X", "X"], ["X", "X", "X", "X", "A", " ", " ", "A"],
>>> ["X", "X", "X", " ", " ", " ", " ", " "], ["X", "X", "X", " ", " ", " "=
,
>>> "A", " "], [" ", "X", " ", "A", " ", " ", " ", " "], [" ", " ", " ", "
>>> ", " ", " ", " ", " "]]
>>>      got: [[" ", "X", "X", "X", " ", "X", "X", "X", "X"], ["X", "X",
>>> "X", "X", " ", " ", "X", "X"], ["X", "X", "X", "X", "A", " ", " ", "A"]=
,
>>> ["X", "X", "X", " ", " ", " ", " ", " "], ["X", "X", "X", " ", " ", " "=
,
>>> "A", " "], [" ", "X", " ", "A", " ", " ", " ", " "], [" ", " ", "X", "
>>> ", " ", " ", "X", "X"]] (using =3D=3D)
>>> ./testes_spec.rb:104:in `block (2 levels) in <top (required)>'
>>>
>>>
>>> The code is here:
>>>
>>> (def Expande)
>>>
>>>
>>> https://bitbucket.org/ronnyamarante/nuvem-de-cinzas/src/dea63a21e63b544=