[Newbies] subclasses detect

gruntfuttuck gruntfuttuck at gmail.com
Tue Jul 31 20:14:40 UTC 2007


In the laser game tutorial by Stephan B Wessels I was intrerested by this

directionFor: aSymbol 
	^ self subclasses
		detect: [:cls | cls directionSymbol = aSymbol]

The code appears here at the bottom of the page:

What I read this code as doing, in this example is: return an symbol object
which is a sublass instance varable, if it is the same as aSymbol.

What would happen if more than one subclass object had a match?

Also how else can subclasses detect: be used? It looks very interesting.


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