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Subject: RE : perform
From: Christophe Le Page (christophe.le_page@cirad.fr)
Date: Tue Apr 20 2004 - 13:31:17 CEST
Hi Joelle,
Good guess, you have to use #perform:with:
The first argument of that method is the selector name, which is a
symbol ending by the character ':'
The second one is the value to be used as the argument of the selector
name.
In your case, it gives:
1 to: 10 do: [:i | self perform: ('var', i printString, ':')
asSymbol with: 100]
This is a concise way to write:
self perform: #var1: with: 100.
self perform: #var2: with: 100.
...
self perform: #var10: with: 100
And this is strictly equivalent to:
self var1: 100.
self var2: 100.
...
self var10: 100
clp
-----Message d'origine-----
De : owner-cormas@cirad.fr [mailto:owner-cormas@cirad.fr] De la part de
Joelle Noailly
Envoyé : mardi 20 avril 2004 09:26
À : cormas
Objet : name variables with printString
Hi everyone,
Thank you Bruno for answering my questions about collections so quickly!
It works fine!
I actually have another question for the Cormas forum. I have a set of
10 variables called var1, ... var10. I want to associate values to these
variables using a loop. I thought of writing something like:
1 to: 10 do: [:i | self ('var', printString i): 100]
but this does not seem to work. Should I use a perform command or
something like that?
Thanks for your help,
cheers,
Joelle Noailly
Bruno Locatelli wrote:
Hi Joelle,
I am trying to create a collection of individual collections. For
instance, I have a series of n elements, each one composed of 5 objects
as follows: element_1={a, b, c, d, e}, element_2= {b, c, d, e, a}, ...
element_n={e, e, d, c, a}.
Now, I want to combine all these elements into a big collection of the
form:
Coll={element_1, element_2, ..., element_n}.
If you write the following code, you will
create a "myBigCollection" containing collections.
myBigCollection := OrderedCollection new.
anElement1 := OrderedCollection new.
anElement1 add: #a.
anElement1 add: #b.
anElement1 add: #c.
anElement1 add: #d.
anElement1 add: #e.
myBigCollection add: anElement1.
etc...
The tricky part is that I also would like to ask the program to browse
through the big collection. For instance, check if the element
corresponding to {b,c,d,e,a} is in the big collection, and if yes,
delete it.
You can work with your "big collection", as you do with any collection.
For instance, to remove an element:
searchedElement := OrderedCollection new.
searchedElement add: #b.
searchedElement add: #c.
searchedElement add: #d.
searchedElement add: #e.
searchedElement add: #a.
myBigCollection remove: searchedElement ifAbsent: [ ]
Another example: if you want to select the elements that contain 'a' as
a
first symbol:
myBigCollection select: [:e | e first = #a]
Suerte!
Ciao
bruno
_____________________________
Bruno Locatelli
Global Change Group / Grupo Cambio Global
CIRAD Forêt (www.cirad.fr) - CATIE (www.catie.ac.cr/cambioglobal)
Apdo 2, Turrialba 7170
Costa Rica
Tel: 506.558.22.16
Fax: 506.556.62.55
Email: bruno@melix.org
Web perso: http://www.locatelli1.net
________________________________