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
--
View this message in context:
http://forum.world.st/I-need-some-explaination-about-arguements-assignment-tp4772102.html
Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
