Beginners September 2008

beginners@lists.squeakfoundation.org

56 participants
87 discussions

unit tests for missing methods
by Mark Volkmann 29 Sep '08

29 Sep '08

I wrote a test for a method that doesn't exist yet and ran it to see what would happen. I expected it would say something about doesNotUnderstand. Instead I got a fairly deep stack trace where the first two lines indicate that I got a signalFailure from the assert method in TestCase. I'm curious why I don't get something a little more descriptive. --- Mark Volkmann

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Re: Are setters a good idea?
by Andy Burnett 29 Sep '08

29 Sep '08

Thank you to everyone who responded. It seems as though the summary view is: 1. don't create setters unless you really need them, because it can make it harder to see when values are changed 2. if one uses action verbs, they should truly reflect the physical or logical action taking place. All of which seems very reasonable to me :-) Cheers AB

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binary method or keyword with one argument
by Mark Volkmann 29 Sep '08

29 Sep '08

Is there a rule of thumb for deciding whether a method that takes one argument should be implemented as a binary method or a keyword method? Do you only use binary when the method is like an mathematical operation? --- Mark Volkmann

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Re: [Newbies] SqueakSVN installation problems
by Marcin Tustin 29 Sep '08

29 Sep '08

When this was announced, I wasn't really clear on what the point is. Does it provide anything in the way of source control that Monticello doesn't? On Sun, Sep 28, 2008 at 11:28 PM, Matthias Korn <matthias.korn(a)uni-siegen.de > wrote: > Hi, > > I was trying to install SqueakSVN from the sar-file provided by HPI at > http://www.swa.hpi.uni-potsdam.de/projects/ssvn/index.html > > After installing I get the message "Everything was installed correctly > but the SqueakSVN VMPlugin could not be loaded" > > Consequently, when trying to create a new project in the > SVNProjectBrowser I'm getting "Error: a primitive has failed". > > Does anyone have an idea on how to fix the VMPlugin? > > I am using sq3.10-7159dev08.03.1.image on Debian Linux with squeak-vm > 1:3.9.8-5. > > Thanks, > Matthias > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners >

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SqueakSVN installation problems
by Matthias Korn 29 Sep '08

29 Sep '08

Hi, I was trying to install SqueakSVN from the sar-file provided by HPI at http://www.swa.hpi.uni-potsdam.de/projects/ssvn/index.html After installing I get the message "Everything was installed correctly but the SqueakSVN VMPlugin could not be loaded" Consequently, when trying to create a new project in the SVNProjectBrowser I'm getting "Error: a primitive has failed". Does anyone have an idea on how to fix the VMPlugin? I am using sq3.10-7159dev08.03.1.image on Debian Linux with squeak-vm 1:3.9.8-5. Thanks, Matthias

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Finding Packages
by Rob Rothwell 28 Sep '08

28 Sep '08

Ok...so I just reported a duplicate OmniBrowser bug, that was reported as fixed in OB-Enhancements-dr.204. But I can't find it in the UniverseBrowser, SqueakSource, or SqueakMap. Is there somewhere else I should be looking for fixes that I don't know about, or am I just not seeing it? I often wonder how many other things I miss this way... Thanks, Rob

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regular expressions
by Mark Volkmann 28 Sep '08

28 Sep '08

Does the standard Squeak image contain a class for operating on regular expressions? --- Mark Volkmann

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Re: [Newbies] Removing 'dead' instances
by Marcin Tustin 28 Sep '08

28 Sep '08

On Sun, Sep 28, 2008 at 5:28 PM, Randal L. Schwartz <merlyn(a)stonehenge.com>wrote: > >>>>> "Andy" == Andy Burnett <andy.burnett(a)knowinnovation.com> writes: > > Andy> Could some kind soul please explain what I am doing wrong here? > Andy> I have a model, called Fspace, which I have created several instances > of, > Andy> whilst I was testing it. > > Andy> Fspace allInstances size reports 9 instances. > > Andy> When I run > > Andy> Fspace allInstancesDo: > Andy> [:each | > Andy> each := nil. > Andy> Transcript show: (each value); cr. > Andy> Smalltalk garbageCollect] > > Andy> The transcript shows that the values are set to nil. However, the > instances > Andy> don't go away. So, what am I doing wrong? > > Setting "each" to "nil" there does nothing, since you aren't > updating the object that was originally in "each". > This is a pretty common misconception. It seems to come up once a month. I wonder why - mostly it's not people who are new to programming, who I would expect to be unfamiliar with the distinction between an object or value and the location it is stored in. > > You need to tell anyone still holding a reference to your objects > to let go. Some advice can be found at http://wiki.squeak.org/squeak/2176 > > -- > Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 > <merlyn(a)stonehenge.com> <URL:http://www.stonehenge.com/merlyn/> > Smalltalk/Perl/Unix consulting, Technical writing, Comedy, etc. etc. > See http://methodsandmessages.vox.com/ for Smalltalk and Seaside > discussion > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners >

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Removing 'dead' instances
by Andy Burnett 28 Sep '08

28 Sep '08

Could some kind soul please explain what I am doing wrong here? I have a model, called Fspace, which I have created several instances of, whilst I was testing it. Fspace allInstances size reports 9 instances. When I run Fspace allInstancesDo: [:each | each := nil. Transcript show: (each value); cr. Smalltalk garbageCollect] The transcript shows that the values are set to nil. However, the instances don't go away. So, what am I doing wrong? Cheers AB

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determine if a String contains a String
by Mark Volkmann 28 Sep '08

28 Sep '08

What's the recommended way to determine if a String contains another String? I found one way. '*substring*' matches: string I'm sure I could use a regular expression, but that seems like overkill. At first I thought I should use include: or contains: from Collection, but apparently not. --- Mark Volkmann

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Beginners September 2008