Note that Ruby arrays re-size as needed

so when j =3D 7 (the last index of a 8 element array)
and you assign a value to j+1, then the array is expanded to 9 elements and
the value stored




On Fri, Nov 22, 2013 at 9:26 PM, Rafael Moraes <
rafaelmoraesdefreitas / gmail.com> wrote:

> Only correcting myself
> none of the ifs with minus operations
>
>
> On 23 November 2013 00:23, Rafael Moraes <rafaelmoraesdefreitas / gmail.com=
>wrote:
>
>>
>> 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"      =
      end            if !esperado[i+1][j].nil?              esperado[i+1][j=
] =3D "X"            end            if !esperado[i][j-1].nil?              =
esperado[i][j-1] =3D "X"            end            if !esperado[i][j+1].nil=
?              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>w=
rote:
>>>
>>>> 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/dea63a21e63b54=
4899c9279e7abea45cadaaacdb/desafio.rb?at=3Dmaster
>>>>
>>>>
>>>> Thanks!
>>>>
>>>> --
>>>> Posted via http://www.ruby-forum.com/.
>>>>
>>>
>>>
>>
>