[Newbies] How to put a block into an Array

[David Finlayson]

Thanks, that did it. There is a nice explaination of this syntax here:

http://www.smalltalk.org/articles/article_20040920_a2.html

which I was not aware of. My Smalltalk books are dated and don't have
the Squeak extensions to the language.

David

On Fri, May 16, 2008 at 12:17 PM, Matthew Fulmer <tapplek at gmail.com> wrote:
> On Fri, May 16, 2008 at 12:11:50PM -0700, David Finlayson wrote:
>> Newbie here, working my way through Guzdial's Squeak: Object-Oriented
>> Design with Multimedia Applications (2001). One of the exercises
>> requires building an Array with a block of code as an element, the
>> idea is to lookup the stored block in some way and execute it. But,
>> how do you store a block of code in an Array?
>>
>> For example, I can do this:
>>
>> [Transcript show: 'a message'] value
>>
>> But I can't get this to work:
>>
>> myArray := #([Transcript show: 'a message']).
>> (myArray at: 1) value
>>
>> The reason is that (myArray at: 1) doesn't recognize the stored object
>> as a block. Inspecting it shows the odd symbol: #[ ??
>>
>> Can someone get me back on the clue train?
>
> the #() syntax only supports numbers and symbols. Use the brace
> syntax, or build the array using messages:
>
> myArray := {[Transcript show: 'a message']}
> myArray := Array with: [Transcript show: 'a message']
>
> --
> Matthew Fulmer -- http://mtfulmer.wordpress.com/
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-- 
David Finlayson, Ph.D.
Operational Geologist

U.S. Geological Survey
Pacific Science Center
400 Natural Bridges Drive
Santa Cruz, CA 95060, USA

Tel: 831-427-4757, Fax: 831-427-4748, E-mail: dfinlayson at usgs.gov