Beginners June 2006

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E-Toys
by Sandy Saline 26 Jun '06

26 Jun '06

Where do I find the most current version of E-Toys? Thanks Sandy

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Re: [Newbies] variableWordSubclass:
by Frank Urbach 26 Jun '06

26 Jun '06

Hi Joaquin, >I wish to create a subclass of FloatArray for a dynamic system simulation. When creating the class with #subclass: the method is automatically changed to #variableWordSubclass: as follows I think the the expression "ArrayedCollection subclass: #DynamicVariable" is the right way you get a subclass of FloatArray. >FloatArray variableWordSubclass: #DynamicVariable >That is fine. But when I wish to create an instance >dv2 _ DynamicVariable new: 2 So far I've seen the hierarchy of FloatArray the method "new:" isn't on the class side anywhere. This is the reason because you get an error. Hope this helps. Cheers, Frank

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Tab navigation
by Mathieu SUEN 26 Jun '06

26 Jun '06

Hi, Does tab control exist in squeak? Because I always use plenty of Workspace and I'm fed up with it. Thanks Math

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Special constants
by Mathieu SUEN 25 Jun '06

25 Jun '06

Hi, Why { -1. 0. 1. 2} are special constants? Thanks Math

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Primitive number
by Mathieu SUEN 24 Jun '06

24 Jun '06

Hi, I have just a litle question. Dose primitive number 0 mean there is no primitive? Math

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how to create an object (of a selection of classes)
by Jeroen van Hilst 23 Jun '06

23 Jun '06

Best List, Im very curious to the the 'smalltalk way' to write the following code: | shape morph | (2 atRandom == 1) ifTrue: [shape := RectangleMorph] ifFalse: [shape := EllipseMorph]. morph := shape new. I've tried something like: (#(EllipseMorph RectangleMorph) at: (2 atRandom)) new. But thats too silly ? Is there some connection to get a class from a symbol ? Or is that the wrong direction ? Thanks in advance, - Jeroen - aspiring squeaker.

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Demystifying "most Smalltalk’s don't directly support multiple inheritance"
by Klaus D. Witzel 23 Jun '06

23 Jun '06

List, haven't you heard that Smalltalk and Squeak do not directly support multiple inheritance, time and again? But that Perl, Python and Ruby do (to some extent)? - http://www.google.com/search?q=python+ruby+multiple+inheritance Well, that is not the case for Smalltalk since the time that VMs are implemented by using the specs of the Blue Book. I have attached a small .st file which demonstrates that the *unchanged* VM *must* support multiple inheritance (for message sends), or else it won't work properly. It's a matter of view on what the VM does for you :-D With the exception of support code for exceptions [pun intended] the attached examples work on VMs which implement the super send from the Blue Book. The first example demonstrates that multiple inheritance works; in this example it is also checked that the requesting method qualifies (that the instances qualify is checked at fileIn time). The second example does a message tally and shows that there is less than 50% overhead when possible walkbacks are guarded at every multiple inheritance message send. The third example employs the existing method cache of the VM (the original Squeak VM) for multiple inheritance message sends and thus minimizes the overhead to less than 5% (and the demo is written in .st code :-) Again, this all exists *unchanged* for decades. It only had to be brought to the surface? ------- I would be very interested to see if my examples run on other platforms and VMs, please post your experience. Thank you. It'd be equally interesting if the approach had been used before. /Klaus

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installation question
by Thomas Keller 22 Jun '06

22 Jun '06

Hi, I've just installed Squeak3.8-MacOS-Full and I noticed that SqueakV3.sourceshas a date modified of Feb 5, 2040, 9:28 PM I know Squeak is "ahead of its time" and I'm really impressed, but don't know what it means. Should I worry? -- Tom "Ecrasez l'Infame!" -- Voltaire

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Exemple of pattern
by Mathieu SUEN 22 Jun '06

22 Jun '06

Hi, I was wondering were I can find some concret exemple of Decorator pattern in squeak. And also:Adapter(I don't really understand the use of it) Abstract Factory Builder and Factory methode thanks, Math

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Headless Seaside Server with Squeak/VNC? (Was: linux squeak startup)
by Mark Aufflick 21 Jun '06

21 Jun '06

On a related note, Ive seen some information about a VNC server implemented within Squeak - that seems to me to be a good way to run a headless seaside server. Is there a particular best practise way of running a headless squeak server? Thanks, Mark. On 6/21/06, Damien Cassou <damien.cassou(a)laposte.net> wrote: > In fact, if you launch your application with exec, it exits the shell > :-) but squeak stays. > > stéphane ducasse a écrit : > > My unxi is rusty but exec should not kill the process when the shell exits. > > > > Stef > > > > > > On 20 juin 06, at 16:42, cdrick wrote: > > > >> Hi all :) > >> > >> do you know how to make an init.d script to start squeak each time a > >> linux server starts... It's for seaside. For now I use a command line > >> squeak -nodisplay myImage.image but when I close the shell, squeak > >> stops too > >> > >> Thanks for all :) > >> > >> Cédrick > >> _______________________________________________ > >> Beginners mailing list > >> Beginners(a)lists.squeakfoundation.org > >> http://lists.squeakfoundation.org/mailman/listinfo/beginners > > > > _______________________________________________ > > Beginners mailing list > > Beginners(a)lists.squeakfoundation.org > > http://lists.squeakfoundation.org/mailman/listinfo/beginners > > > > > > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners > -- Mark Aufflick e: mark(a)pumptheory.com w: mark.aufflick.com p: +61 438 700 647 f: +61 2 9436 4737

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Beginners June 2006