[Newbies] selectors for an array of classes

[Bert Freudenberg]

On 03.07.2011, at 19:48, Jonathan Wright wrote:

> On Sun, 3 Jul 2011 18:47:09 +0200
> Bert Freudenberg <bert at freudenbergs.de> wrote:
> 
>> On 03.07.2011, at 18:35, Jonathan Wright wrote:
>> 
>>> 
>>> Hello,
>>> 
>>> I am trying to read the methods of several classes.  I am getting a
>>> messagenotunderstood for the following code:
>>> 
>>> TempObject := #(OrderedCollection Integer).
>>> 	TempObject do: [ :iClass |
>>> 			iClass selectorsDo: [ :item |
>>> 				item.]].
>>> 
>>> I can run a iClass name successfully.
>> 
>> Try iClass class, that should be enlightening ;)
>> 
>>> But it doesn't seem to recognize iClass selectors.
>> 
>> The "name" message works on any (see Object>>name). iClass is not
>> actually a class in your example.
>> 
>> Hint 1: #() creates a literal array.
>> 
>> Hint 2: Classes are not literals.
>> 
>> Hint 3: {} creates a non-literal array.
>> 
>> Nitpick: temps should have lowercase-names.
>> 
>> - Bert -
>> 
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> 
> Awesome, thanks for the hints!  It works now!
> 
> In finding information about non-literal arrays, it seems you put
> periods in between the array contents.
> 
> I'm not sure I understand iClass class.  It just seems to add class at
> the end.  I suppose I would now have extra methods to work with in
> doing that?

No, I meant if you had tried that in your original example it would have answered "Symbol". Because that's what literal arrays store for unembellished identifiers (except for "nil", "true", and "false").

> Regarding TempObject, yeah I've been using it as a global variable for a
> while now, so it should be capitalized in my case.  :-)  I read all
> about the capitalization guidelines for smalltalk and it all makes
> sense to me.

In that case, it's all right. I guess the appropriate longevity of "temp" vars is in the eye of the beholder ;)

- Bert -