On Thu, Aug 7, 2014 at 8:43 AM, aria2end <aria2end@gmail.com> wrote:

Hello, I am new to smalltalk and I would really appreciate your help so I can
better use and understand Pharo.

So here is the problem, I wanted to implement a function to get the value of
my tree struct nodes in a recursive manner and I wanted to concatenate them
to a String ( aText ) and later show them on the Transcript.

showLists
�� | aText |
�� aText ��:= ��lol level, ��(String with: Character cr).
�� self recursiveShowLists: lol withText: aText tabsNumber: 1.

recursiveShowLists: aLoL withText: aText tabsNumber: aNumb
�� | counter index |
�� aLoL lols isEmpty
�� ifFalse: [
�� counter := 1.
�� [ counter <= aNumb ]
�� whileTrue: [
�� aText := aText , (String with:
Character tab).
�� counter := counter + 1 ].
�� index := 1.
�� aNumb := aNumb + 1.
�� LoL lols do: [ :each | aText := aText , each level ,
(String with: Character cr) ].
�� ]

Without having the last line ( LoL lols do: ... ) everything works fine but
when I include it and as soon as debugger reaches to [counter <= aNumb ] and
wants to evaluate it, my arguments start to act weird. aText will become nil
and aNumb will hold te value of aText!

I fixed this issue by adding another temporary variable ( copyText ) and
instead of direct assignment of aText I used the copyText:

recursiveShowLists: aLoL withText: aText tabsNumber: aNumb
�� | counter index copyText |
�� copyText := aText.
�� aLoL lols isEmpty
�� ifFalse: [
�� counter := 1.
�� [ counter <= aNumb ]
�� whileTrue: [
�� copyText := copyText , (String with:
Character tab).
�� counter := counter + 1 ].
�� index := 1.
�� aLoL lols do: [ :each | copyText := copyText , each
level , (String with: Character cr) ] ]

I really like to know the reason behind this issue, ��I appreciate all the
explanations.
Thanks,
Aria

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