- Pharo-dev - lists.pharo.org

Re: [Pharo-project] Have started an independent developer activity - Thank you

by laurent laffont

On Sat, Apr 9, 2011 at 12:59 PM, Sven Van Caekenberghe <sven(a)beta9.be>wrote: > > On 09 Apr 2011, at 09:34, laurent laffont wrote: > > > Hi, > > > > I discovered Smalltalk and Pharo almost three years ago and just after > read Chad Fowler book "Passionate Programmer" (1st edition title was "My job > went to India"). These have changed my developer life, how I perceive > software and that great technology is fun, people doing it more. You're a > cool community and I'm proud to be there. > > > > Now I've started an aside (paid :) independent developer activity thanks > to a cool guy. That would not be possible without all the stuff I learn > every day from the community and the urge to continue you give me. > > Great for you Laurent, you absolutely deserve, I wish you success. > Thank you ! Laurent > > > Each time I've made a step forward (open a blog, write ProfStef, fix > bugs, create PharoCasts) I've been amazed that the generated effects were > those described in Passionate Programmer (go read it !) The last chapter is > "Go independent" so now I need the sequel ;) > > > > Special big thank you to StÃ©phane Ducasse - you're crazy :) Long live > Pharo ! > > > > > > PS: nice piece of Passionate Programmer: > > > > When I was in India weeding through hundreds of candidates for only > > tens of jobs, the interview team was exhausting itself and running out > > of time because of a poor interview-to-hire hit rate. Heads hurting and > > eyes red, we held a late-night meeting to discuss a strategic change in > the > > way we would go through the candidates. We had to either optimize the > > process so we could interview more people or somehow interview better > > people (or both). With what little was left of my voice after twelve > straight > > hours of trying to drag answers out of dumbstruck programmers, I argued > > for adding Smalltalk to the list of keywords our headhunters were using > > to search their rÃ©sumÃ© database. But, nobody knows Smalltalk in India, > cried > > the human resources director. That was my point. Nobody knew it, and > > programming in Smalltalk was a fundamentally different experience than > > programming in Java. The varying experience would give candidates a > > different level of expectations, and the dynamic nature of the Smalltalk > > environment would reshape the way a Java programmer would approach > > a problem. My hope was that these factors would encourage a level of > > technical maturity that I hadnât been seeing from the candidates Iâd met > so > > far. > > The addition of Smalltalk to the requirements list yielded a candidate > pool > > that was tiny in contrast to our previous list. These people were > diamonds > > in the rough. They really understood object-oriented programming. They > > were aware that Java isnât the idealistic panacea itâs sometimes made out > > to be. Many of them loved to program! Where have you been for the past > two > > weeks? we thought. > > Unfortunately, our ability to attract these developers for the salaries > we > > were able to pay was limited. They were calling the shots, and most of > > them chose to stay where they were or to keep looking for a new job. > > Though we failed to recruit many of them, we learned a valuable recruit- > > ing lesson: we were more likely to extend offers to candidates with > diverse > > (and even unorthodox) experience than to those whose experiences were > > homogenous. My explanation is that either the good people seek out > > diversity, because they love to learn new things, or being forced into > alien > > experiences and environments created more mature, well-rounded soft- > > ware developers. I suspect itâs a little of both, but regardless of why > it > > works, we learned that it works. I still use this technique when looking > > for developers. > > Nice story, very true here as well, developers with broad interests are > better, but there are not many of them. > > > Laurent Laffont - @lolgzs > > > > Pharo Smalltalk Screencasts: http://www.pharocasts.com/ > > Blog: http://magaloma.blogspot.com/ > > Developer group: http://cara74.seasidehosting.st > > > > > > >

April 9, 2011

Re: [Pharo-project] Have started an independent developer activity - Thank you

by laurent laffont

On Sat, Apr 9, 2011 at 11:33 AM, Marcus Denker <marcus.denker(a)inria.fr>wrote: > > On Apr 9, 2011, at 9:34 AM, laurent laffont wrote: > > Hi, > > I discovered Smalltalk and Pharo almost three years ago and just after read > Chad Fowler book "Passionate Programmer" (1st edition title was "My job went > to India"). These have changed my developer life, how I perceive software > and that great technology is fun, people doing it more. You're a cool > community and I'm proud to be there. > > Now I've started an aside (paid :) independent developer activity thanks to > a cool guy. That would not be possible without all the stuff I learn every > day from the community and the urge to continue you give me. > > Each time I've made a step forward (open a blog, write ProfStef, fix bugs, > create PharoCasts) I've been amazed that the generated effects were those > described in Passionate Programmer (go read it !) The last chapter is "Go > independent" so now I need the sequel ;) > > So we can add an entry to the "companies using pharo" soon, I hope! > > http://www.pharo-project.org/about/success-stories > I don't have a company name and no website yet.... But I hope too ! Laurent > > > -- > Marcus Denker -- http://www.marcusdenker.de > INRIA Lille -- Nord Europe. Team RMoD. > >

April 9, 2011

Re: [Pharo-project] Unexpected behavior of roundTo:

by Andres Valloud

On 4/9/11 0:28 , Marcus Denker wrote: > > On Apr 9, 2011, at 9:09 AM, Andres Valloud wrote: > >> I think the real solution to these "problems" is to implement >> decimal floating point as per IEEE-754/2008. \\ > > The MPFR lib seems to me (as far as I understand) is inspired by IEEE > 754 > > <quote from the docs> The docs seem to suggest MPRF implements variable precision binary floating point numbers. IEEE-754/2008, as opposed to IEEE-754/1985, also specifies types for base 10 (i.e.: decimal) floating point numbers. In other words, 2.5 wouldn't be represented as (101)_2, but (25)_10. Thus, going back to the original problem that caused this discussion, > 2.8011416510246336 roundTo: 0.01 > > returns > > 2.8000000000000003 the problem here is that there is no binary floating point number that can represent the number 0.01. The arguments why this is so are the usual (and I just put them here for the sake of completeness): binary floating point numbers represent fractions of the form +/- m * 2^k where m, k are integers such that 0 <= m < M, and e <= k <= K. So let's try to find which values of m and k match for 0.01: 1/100 = m * 2^k Well, m is not zero, so it must be at least 1, and so k must be negative. Set k' = -k and rearrange: 2^k' = 100m Now we invoke the help of the fundamental theorem of arithmetic that says integers can be factored into primes in only one way. On the left we only have 2 as a prime factor. On the right, there is a factor of 5. Therefore, we conclude the above equality is impossible. So, m and k do not exist, and so no binary floating point number is equal to 0.01. To make the story short, you cannot assume lossless operation just because you can see a base 10 print string. If loss of precision is the issue because we only have 2^k' on the left, let's try base 10 instead. In other words, floating point numbers in which the base is 10 represent values of the form +/- m * 10^k where m, k are integers such that 0 <= m < M, and e <= k <= K. So let's try to find which values of m and k match for 0.01: 1/100 = m * 10^k So now we just match the fraction on the left with m=1 and k=-2. Done. Of course, there are values that cannot be represented without loss of precision, but the loss of precision involves only m and k. For example, 67423523487542376543765376234576235726345623472 = m * 10^k when 0 <= m < M and M = 9. There are not enough digits in the mantissa, so the result is going to be 7*10^k for some k. But this issue happens as well with binary floating point numbers when k is positive. Try 67423523487542376543765376234576235726345623472 asFloat truncated Increasing the precision of binary floating point numbers to arbitrary precision help you if you need a bigger mantissa, but a bigger mantissa does not solve the fundamental problem of binary floating point numbers that causes imprecision whenever you use base 10 to write down values. > MPFR is LGPL, so linking that in the VM or using it via FFI is no > problem license wise. I am not convinced that's what you need: http://en.wikipedia.org/wiki/Decimal_floating_point And it looks like Intel wrote a decimal floating point library, too... now I need to check the license on this one as well: http://software.intel.com/en-us/blogs/2008/03/06/intel-decimal-floating-poi… Andres.

April 9, 2011

Re: [Pharo-project] Issue 3975 in pharo: References to ivars shortcut

by pharo＠googlecode.com

Comment #2 on issue 3975 by renggli: References to ivars shortcut http://code.google.com/p/pharo/issues/detail?id=3975 Cool idea, I've added the same to OB.

April 9, 2011

Re: [Pharo-project] Help (perfect for newcomers) migrating a technical FAQ

by Mariano Martinez Peck

Excellent!!! :) Thanks to all of you for the offer. On Sat, Apr 9, 2011 at 7:16 PM, Max Leske <maxleske(a)gmail.com> wrote: > I am. > > I'll do a very quick migration only because I don't have much time. It can > be beautified later. If that's ok with everyone I'll do it tonight. > > Max > > On 09.04.2011, at 14:45, Mariano Martinez Peck wrote: > > One year after..... anyone interested ? > > On Thu, May 13, 2010 at 10:37 PM, Mariano Martinez Peck < > marianopeck(a)gmail.com> wrote: > >> Hi folks. I had a good idea and and it perfect for someone that wants to >> help and don't know how. It is not the most entertained task, but I promise >> you will learn a lot. Mostly, if you are newcomer. >> >> The idea is basically to migrate the FAQ that is here: >> >> http://scg.unibe.ch/wiki/faq/pharofaq >> >> to a new section in the collaborative Pharo book: >> >> http://book.pharo-project.org/ >> >> So....any takers ? Let us know so that we generate a new user in the Book >> >> The idea is also to check whether what is says is still correct for pharo >> or if it needs an update. Or even how to improve it (from the view of a >> newcomer). >> >> Thanks >> >> Mariano >> > > > > -- > Mariano > http://marianopeck.wordpress.com > > > -- Mariano http://marianopeck.wordpress.com

April 9, 2011

Re: [Pharo-project] Help (perfect for newcomers) migrating a technical FAQ

by Max Leske

I am. I'll do a very quick migration only because I don't have much time. It can be beautified later. If that's ok with everyone I'll do it tonight. Max On 09.04.2011, at 14:45, Mariano Martinez Peck wrote: > One year after..... anyone interested ? > > On Thu, May 13, 2010 at 10:37 PM, Mariano Martinez Peck <marianopeck(a)gmail.com> wrote: > Hi folks. I had a good idea and and it perfect for someone that wants to help and don't know how. It is not the most entertained task, but I promise you will learn a lot. Mostly, if you are newcomer. > > The idea is basically to migrate the FAQ that is here: > > http://scg.unibe.ch/wiki/faq/pharofaq > > to a new section in the collaborative Pharo book: > > http://book.pharo-project.org/ > > So....any takers ? Let us know so that we generate a new user in the Book > > The idea is also to check whether what is says is still correct for pharo or if it needs an update. Or even how to improve it (from the view of a newcomer). > > Thanks > > Mariano > > > > -- > Mariano > http://marianopeck.wordpress.com >

April 9, 2011

Re: [Pharo-project] [Pharo-users] 1.2.1 Windows no-no

by Mariano Martinez Peck

On Sat, Apr 9, 2011 at 7:07 PM, Robert Shiplett <grshiplett(a)gmail.com>wrote: > I just inspected the pharo LNK file of my new > > C:\Pharo-1.2.1-CogOneClick.app > > and it is set to start in > > > "C:\Documents and Settings\Administrator\Desktop\OneClick.app" > > > WRONG! > > I am logged in as another user and not as Administrator ( which on XP > I only enter from Safe Mode ) > > > Pharo might be okay using my > > C:\Documents and Settings\Owner\Local Settings\Application Data > > I have reset the LNK as starting in > > C:\Pharo-1.2.1-CogOneClick.app\Contents\Resources > > and reset the TARGET to > > C:\Pharo-1.2.1-CogOneClick.app\Contents\Windows\Squeak.exe pharo.image > > > Some Windows users would not be amused to see this Administrator ... > as all too often spyware goes where it does not belong ... especially > on Corp desktops. > Can you please submit an issue with that please? Check these threads: http://forum.world.st/template/NamlServlet.jtp?macro=search_page&node=12948… > > If we use an sh for Linux, why can't we use a simple BAT for Windows? > > Are you aware of the Windows installer ? -- Mariano http://marianopeck.wordpress.com

April 9, 2011

[Pharo-project] TestResource bug?

by Guillermo Polito

Hi! I'm using pharo 1.2 and I've found a little problem in here TestResource>>makeAvailable "This method must be the _only_ way to set a notNil value for the unique instance (current). First, obtain a candidate instance and set current to a notNil placeholder (any notNil object not an instance of me would do; this version uses false). Next, check any subordinate resources needed by this resource. Lastly, setUp the candidate and put it in current if it is available, ensuring that it is torn down otherwise." | candidate | * current := false.* candidate := self new. self resources do: [:each | each availableFor: candidate]. [candidate setUp. candidate isAvailable ifTrue: [current := candidate]] ensure: [current == candidate ifFalse: [candidate tearDown]] And everywhere in the class, the check over the current class instance var is done like current isNil ifTrue: .... So once that var is initialized, but the makeAvailable fails, it always fails... Is this a bug or i'm doing a mistake? Shouldn't *current := false be changed *be changed by *current := nil. *??* *Thanks! Guille

April 9, 2011

Re: [Pharo-project] Initial PetitC parser

by Javier PimÃ¡s

Good! Then we can do this in half the time with half the effort each (if it's not already done). Regards, Javier. 2011/4/9 StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> > in that case you have also cil in oCaml used by Frama-C. > > But I do not think that this is necessary to read all the ressources of > earth. > > Javier contact nick because he started (I guess to implement a parser for C > using PP). > > Stef > On Apr 8, 2011, at 8:25 PM, Alexandre Bergel wrote: > > > A good source of ideas: http://www.sdml.info/projects/srcml/ > > > > Alexandre > > > > > > On 8 Apr 2011, at 12:57, Javier PimÃ¡s wrote: > > > >> > >> > >> On Fri, Apr 8, 2011 at 1:08 PM, Alexandre Bergel < > alexandre.bergel(a)me.com> wrote: > >> What is tricky with analyzing C are macros and preprocessors directive. > >> srcML does a satisfactory job. But indeed, having a solution based on > PetitParser is indeed promising. > >> > >> Yes, and I don't know what to do, and would like to know if you or > someone else have any idea of how to solve it. I will think some approach, > but if you have some idea to share it would be better so I go directly to a > good solution. I'm thinking that to feed the parser I'll have to preprocess > the string with another parser, and make a string to string conversion by > having a set of defines and paths so that #includes and #ifdefs work. But > probably I'll need a cache because the generated string will be huge. > >> > >> What do you think? > >> > >> Regards, > >> Javier. > >> > >> Cheers, > >> Alexandre > >> > >> > >> On 7 Apr 2011, at 23:53, Javier PimÃ¡s wrote: > >> > >>> by the way, the grammar is based on > >>> > >>> http://www.quut.com/c/ANSI-C-grammar-l-1998.html > >>> > >>> and > >>> > >>> http://www.quut.com/c/ANSI-C-grammar-y.html > >>> > >>> I'd be very grateful if you contribute to cover the full extent of it! > >>> > >>> > >>> On Fri, Apr 8, 2011 at 12:37 AM, Javier PimÃ¡s < > elpochodelagente(a)gmail.com> wrote: > >>> Hi, > >>> I took some time to start developing a C parser with PetitParser. I > used the slides of the smalltalk school, they were pretty useful, and after > some hours I have a very basic tokens scanner. The idea of this work is to > be able to feed the parser with C headers and automagically get the C > bindings done in smalltalk. > >>> > >>> Now I have to actually start doing something with the scanned code. How > should I do that, all in the same class? What if I want to generate bindings > for different kinds of FFIs? Other question, how should I handle > preprocessing? (now there isn't any kind of preprocessing) > >>> > >>> You can see the code, download it and commit improvements to the repo > at www.squeaksource.com/Bindings > >>> > >>> Anybody who is interested is welcomed to help in the development! > >>> > >>> Regards, > >>> Javier. > >>> > >>> -- > >>> Javier PimÃ¡s > >>> Ciudad de Buenos Aires > >>> > >>> > >>> > >>> -- > >>> Javier PimÃ¡s > >>> Ciudad de Buenos Aires > >> > >> -- > >> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > >> Alexandre Bergel http://www.bergel.eu > >> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> -- > >> Javier PimÃ¡s > >> Ciudad de Buenos Aires > > > > -- > > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > > Alexandre Bergel http://www.bergel.eu > > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > > > > > > > -- Javier PimÃ¡s Ciudad de Buenos Aires

April 9, 2011

Re: [Pharo-project] thx to Code Snippets

by HwaJong Oh

As you said in the post PharoFAQ is old, and codes seems more outdated than CodeSnippets. Maybe ProfStef + Metacello is more reliable medium than web page. the collaborAction book looks very interesting. I better read it then trying rest of the PharoFAQs. Best Regards -- View this message in context: http://forum.world.st/thx-to-Code-Snippets-tp3438383p3438416.html Sent from the Pharo Smalltalk mailing list archive at Nabble.com.

April 9, 2011