Re: [Newbies] error trap
Alle 18:16, mercoledì 9 agosto 2006, Ron Teitelbaum ha scritto: Hi Davide, I just wrote up something like this for Sedar: http://lists.squeakfoundation.org/pipermail/beginners/2006-August/000701.ht m l To answer your question directly the answer is yes and no. MAny thanks to all of you, now it's clear what I have to do. I'll try to modify my method. Best Regards -- --- Davide Arrigo ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Re: Re: [Newbies] Why hasn't Smalltalk been wildly accepted?
When I get home(and if the weather isn't too nice) I play with Squeak. But when I go to work, I write Java(like a lot of people on this list, I'd imagine). One of the things that prevents me from even considering it at work is the lack of Oracle driver support. Of course, I could write that support myself using named primitives(and I've tried), but the documentation on how to use all the modern Slang features and tie the whole thing into XCode is much too sparse. When this changes I might be able to use squeak for more than just amusement. On 8/9/06, Keith Hodges [EMAIL PROTECTED] wrote: Java gained ground because anyone who wanted to try it could just download it and learn it. This wasn't possible with Smalltalk - so nobody learned it. At least, this is how things looked to me as an enterprise systems architect in the mid-1990's. This was the picture pre 1995 I think, since then... Other smalltalk vendors came into the market. Smalltalk Agents was about 300 pounds in 1994. Squeak was free in 1996, Dolphin was free initially also in about 1996. When I wanted to write an industrial strength project I downloaded ST/X for free and although some sources were missing I could certainly learn enough and demonstrate enough to justify using it on a project. If you ask any programmer in the UK, what about Dolphin I think that you will get a blank look. Its all down to marketing marketing and more marketing. Even my grannie probably knows that Java is a progamming language. Having said this, because Smalltalk is relatively easy to learn once you are over the initial learning cliff, people have not seen the value in good documentation. Pick any product that you wish to learn, go to your local book shop and see what is there. The Pragmatic PRogrammer was a book about ruby, and that book single handedly launched ruby into the mainstream, without the hype that surrounded java. Smalltalk has lacked bookshelf presence, and I think that as soon as Seaside gets a book out there that O'Reilly puts an animal on the front of it the better. just my 2p Keith ___ Inbox full of spam? Get leading spam protection and 1GB storage with All New Yahoo! Mail. http://uk.docs.yahoo.com/nowyoucan.html ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] Re: Re: Why hasn't Smalltalk been wildly accepted?
On Thu, 10 Aug 2006 14:43:46 +0200, Michael Kohout wrote: When I get home(and if the weather isn't too nice) I play with Squeak. But when I go to work, I write Java(like a lot of people on this list, I'd imagine). 8-) One of the things that prevents me from even considering it at work is the lack of Oracle driver support. Of course, I could write that support myself using named primitives(and I've tried), but the documentation on how to use all the modern Slang features and tie the whole thing into XCode is much too sparse. When this changes I might be able to use squeak for more than just amusement. Michael, have you seen the SQLite3 package on SqueakMap. It is more than easy to interface an external library from Squeak, no Slang, no C-compiler needed (if you don't depend on callbacks). The SQLite3 Squeak code is authored for calling into an external library on Mac OS X but it's a matter of minutes to change that to MS$ windoze or linux (I know that you're using Squeak on OS X...) Hope that it's a rainy day at your site ;-) /Klaus ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
RE: [Newbies] Re: Re: error trap
From: Klaus D. Witzel
On Wed, 09 Aug 2006 21:11:40 +0200, Ron Teitelbaum wrote:
Brian,
Yes I agree it's a great suggestion, although a few changes:
Literal blocks to not parse into collections automatically.
Ron, please: a literal Array is a subclass of Collection and so the blocks
in
{ [nil]. [true]. [false] }
Learn something every day!
parse into collections automatically. You didn't inspectIt for verifying
your (false) claim, didn't you.
No I didn't! The { } just looked so wrong and like C! I'm used to #()
which of course doesn't work.
Also, have a look at the implementors of
#caseOf: and #caseOf:otherwise:, they are heavy users of literal blocks in
Collections ...
I will!
...
Each in this case is already a block.
Yes. And, into the other direction, even in good core methods one often
finds things like
^ dict at: aKey ifAbsent: [nil]
I started to write this too but thought about some of the errors that people
receive about wrong form of block and didn't want to scare people.
There seems to be a natural confusion between object value and block
value. Not a big surprise since Java and other procedural-oriented
friends do not offer block values. So any demo of using blocks as if
they where any other object, as Brian has shown, is a sign for the ability
to master the subject 8-)
Only each is needed.
Absolutely.
So here is a version that works.
(OrderedCollection new
add: [10/0];
add: [2 raisedToInteger: 1/2];
add: [-5 raisedTo: 1.5]; yourself
) do: [:each | each on: Exception do: [:ex | Transcript show: ex; cr;
endEntry]].
endEntry is for Klaus!
Hhm, endEntry is too expensive within any and every loop. Just put
Transcript endEntry after the loop. I mentioned endEntry because
Transcript almost always does not display the last lines (they are
buffered) and people get confused and believe that either their code or
Squeak is wrong (but both is not the case).
It is a very good suggestion Brian!
Indeed, and Briant's use of literal blocks in a literal Array is perfect
(in the sense of: cannot be made better).
Thanks for your correction Klaus! With programming always keep an open
mind, there is lots more to learn!
Ron
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[Newbies] Re: error trap
On Thu, 10 Aug 2006 17:27:09 +0200, Roel Wuyts wrote: Note: no need for the endEntry when using show: it does it already (see TranscriptStream#show: ) Use a 'manual' endEntry when you would use nextPutAll: or print: etc. on the Transcript (which most people do not use anyway). Right you are! But I'm writing on recycled web pages, those with notoriously small margin, therefore I tend to believe that people point to the methods mentioned (like #endEndtry) and curiously look for implementors and other good things in the same message category, the famous cmd-m followed by a cmd-b and/or cmd-m :p /Klaus ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] Re: error trap
Hi Ron,
on Thu, 10 Aug 2006 17:02:11 +0200, you wrote:
From: Klaus D. Witzel
... You didn't inspectIt for verifying
No I didn't! The { } just looked so wrong and like C!
Yes, same for me when I saw that for the first time in Squeak. Never saw
that in Smalltalk/2.x (didn't look for it in VW).
But nowaday's I wonder how we have done it for so many decades without
handsome {expression. 'constant'. [block]} select: [:everything |
everything isAnObject].
/Klaus
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