March 2014 - Pharo-users - lists.pharo.org

Re: [Pharo-users] challenges

by Ben Coman

March 31, 2014

Re: [Pharo-users] [ANN] JNIPort for Pharo 3.0 alpha

by Tudor Girba

Hi Joachim, Thanks for the answer. I suspected that it goes in this direction :). Now, the next question. I saw that it is possible to enable callbacks, but I could not find an example of how it works. For example, could we model this: - in a JavaClassOriginator class we have a method like execute(JavaClassTargetInterface target) { target.m() } - In Pharo we create PharoClassTargetImplementation as an implementation of JavaClassTargetInterface - passing an instance of PharoClassTargetImplementation to JavaClassOriginator results in calling PharoClassTargetImplementation>>m ? Cheers, Doru On Sat, Mar 29, 2014 at 11:32 AM, Joachim Geidel < joachim.geidel(a)onlinehome.de> wrote: > Hi Doru, > > Am 27.03.2014 um 13:07 schrieb Tudor Girba: > > Just a question: is there a way to communicate with an already running > VM that was started independently from Pharo? > > JNIPort uses the Java VM as a DLL / shared library, using the Java > Invocation Interface which is part of the Java Native Interface. Actually, > the Java VM *is* a shared library, and the java.exe is just a wrapper for > starting it. When using JNIPort, the Pharo VM and the Java VM run in the > same operating system process, and communicating with the Java VM just > means calling functions from a library. > > Communicating with an already running Java VM is a totally different use > case, as the Pharo VM and the Java VM run in two different operating system > processes. To establish a communication between them, you would have to use > an inter-process communication mechanism available in both of them. Pipes, > TCP sockets, a messaging system, or running one of them as a server and the > other as a client using a common protocol. That's not what JNIPort is made > for, and what you need for implementing it depends on the communication > mechanism. > > HTH, > Joachim > > > -- www.tudorgirba.com "Every thing has its own flow"

March 31, 2014

Re: [Pharo-users] challenges

by Sven Van Caekenberghe

On 31 Mar 2014, at 20:01, phil(a)highoctane.be wrote: > > On Mon, Mar 31, 2014 at 7:55 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > That book is too advanced I think. > > That set of AndrÃ¨s books sure made my head hurt. > > Like in: Read a couple pages. Feel dizzy. Re-read. Code. Think. Grok. Go for more. > > But every section has very practical uses. Don't get me wrong, it is an excellent book, well worth the read, but I think it is most useful when you already have a decent basis. I found it one of the best, if not the best book about programming I ever read. > Phil > > > On 31 Mar 2014, at 19:07, phil(a)highoctane.be wrote: > > > On Mon, Mar 31, 2014 at 6:41 PM, Roelof Wobben <r.wobben(a)home.nl> wrote: > > Ben Coman schreef op 31-3-2014 18:30: > > Roelof Wobben wrote: > > Hello, > > > > I almost get book 1 ready. > > > > Now I wonder if there are challenges so I can practise more in Smaltalk. > > I know I learn the best by doing things and not just read about it. > > > > I like the most if the challenges can start at simple and get more complex . > > > > As example what I mean is 99 prolog/python problems > > > > Roelof > > > > > > > > I'm not aware of anything similar. It does look interesting and probably something that should be looked into further. > > > > Alternatively, sorry its not a challenge, but as a next step I highly recommend LaserGame tutorial > > http://squeak.preeminent.org/tut2007/html/ > > > > for which you'll should Squeak 3.9 (a predecessor to Pharo) > > http://ftp.squeak.org/3.9/ > > > > The great thing with this is it leads you through a uniquely Smalltalk approach to developing that is colloquially known as "developing from within the debugger" and it shows how to use Smalltalk facilities to refactor code as the design evolves. From the tutorial "Every step of the process is described in detail. Even when I made mistakes. The idea here is to show how natural it is to iterate over design and implementation and the confidence that builds with test driven development." > > > > This tutorial is one of the things that really hooked me into Smalltalk. > > > > cheers -ben > > > > > > > > > > > > Thanks, this looks very interresting. And I think at first glance it can be done on Pharo also. > > > > If I have enough knowlegde Im thinking about tryimg to make a sort of repo-browser for the linux distro I work on. > > But that will take a long time before I am at that point. > > > > Roelof > > > > If you want to stretch the envelope, get a copy of this one: > > > > http://www.lulu.com/shop/andres-valloud/a-mentoring-course-on-smalltalk/pap… > > > > And make the exercises... > > > > You'll not be the same afterwards. > > > > Phil > > > > > >

March 31, 2014

Re: [Pharo-users] challenges

by phil＠highoctane.be

On Mon, Mar 31, 2014 at 7:55 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > That book is too advanced I think. > That set of AndrÃ¨s books sure made my head hurt. Like in: Read a couple pages. Feel dizzy. Re-read. Code. Think. Grok. Go for more. But every section has very practical uses. Phil > > On 31 Mar 2014, at 19:07, phil(a)highoctane.be wrote: > > > On Mon, Mar 31, 2014 at 6:41 PM, Roelof Wobben <r.wobben(a)home.nl> wrote: > > Ben Coman schreef op 31-3-2014 18:30: > > Roelof Wobben wrote: > > Hello, > > > > I almost get book 1 ready. > > > > Now I wonder if there are challenges so I can practise more in Smaltalk. > > I know I learn the best by doing things and not just read about it. > > > > I like the most if the challenges can start at simple and get more > complex . > > > > As example what I mean is 99 prolog/python problems > > > > Roelof > > > > > > > > I'm not aware of anything similar. It does look interesting and > probably something that should be looked into further. > > > > Alternatively, sorry its not a challenge, but as a next step I highly > recommend LaserGame tutorial > > http://squeak.preeminent.org/tut2007/html/ > > > > for which you'll should Squeak 3.9 (a predecessor to Pharo) > > http://ftp.squeak.org/3.9/ > > > > The great thing with this is it leads you through a uniquely Smalltalk > approach to developing that is colloquially known as "developing from > within the debugger" and it shows how to use Smalltalk facilities to > refactor code as the design evolves. From the tutorial "Every step of the > process is described in detail. Even when I made mistakes. The idea here is > to show how natural it is to iterate over design and implementation and the > confidence that builds with test driven development." > > > > This tutorial is one of the things that really hooked me into Smalltalk. > > > > cheers -ben > > > > > > > > > > > > Thanks, this looks very interresting. And I think at first glance it can > be done on Pharo also. > > > > If I have enough knowlegde Im thinking about tryimg to make a sort of > repo-browser for the linux distro I work on. > > But that will take a long time before I am at that point. > > > > Roelof > > > > If you want to stretch the envelope, get a copy of this one: > > > > > http://www.lulu.com/shop/andres-valloud/a-mentoring-course-on-smalltalk/pap… > > > > And make the exercises... > > > > You'll not be the same afterwards. > > > > Phil > > > > > >

March 31, 2014

Re: [Pharo-users] challenges

by Sven Van Caekenberghe

That book is too advanced I think. On 31 Mar 2014, at 19:07, phil(a)highoctane.be wrote: > On Mon, Mar 31, 2014 at 6:41 PM, Roelof Wobben <r.wobben(a)home.nl> wrote: > Ben Coman schreef op 31-3-2014 18:30: > Roelof Wobben wrote: > Hello, > > I almost get book 1 ready. > > Now I wonder if there are challenges so I can practise more in Smaltalk. > I know I learn the best by doing things and not just read about it. > > I like the most if the challenges can start at simple and get more complex . > > As example what I mean is 99 prolog/python problems > > Roelof > > > > I'm not aware of anything similar. It does look interesting and probably something that should be looked into further. > > Alternatively, sorry its not a challenge, but as a next step I highly recommend LaserGame tutorial > http://squeak.preeminent.org/tut2007/html/ > > for which you'll should Squeak 3.9 (a predecessor to Pharo) > http://ftp.squeak.org/3.9/ > > The great thing with this is it leads you through a uniquely Smalltalk approach to developing that is colloquially known as "developing from within the debugger" and it shows how to use Smalltalk facilities to refactor code as the design evolves. From the tutorial "Every step of the process is described in detail. Even when I made mistakes. The idea here is to show how natural it is to iterate over design and implementation and the confidence that builds with test driven development." > > This tutorial is one of the things that really hooked me into Smalltalk. > > cheers -ben > > > > > > Thanks, this looks very interresting. And I think at first glance it can be done on Pharo also. > > If I have enough knowlegde Im thinking about tryimg to make a sort of repo-browser for the linux distro I work on. > But that will take a long time before I am at that point. > > Roelof > > If you want to stretch the envelope, get a copy of this one: > > http://www.lulu.com/shop/andres-valloud/a-mentoring-course-on-smalltalk/pap… > > And make the exercises... > > You'll not be the same afterwards. > > Phil >

March 31, 2014

Re: [Pharo-users] challenges

by phil＠highoctane.be

On Mon, Mar 31, 2014 at 6:41 PM, Roelof Wobben <r.wobben(a)home.nl> wrote: > Ben Coman schreef op 31-3-2014 18:30: > >> Roelof Wobben wrote: >> >>> Hello, >>> >>> I almost get book 1 ready. >>> >>> Now I wonder if there are challenges so I can practise more in Smaltalk. >>> I know I learn the best by doing things and not just read about it. >>> >>> I like the most if the challenges can start at simple and get more >>> complex . >>> >>> As example what I mean is 99 prolog/python problems >>> >>> Roelof >>> >>> >>> >>> I'm not aware of anything similar. It does look interesting and >> probably something that should be looked into further. >> >> Alternatively, sorry its not a challenge, but as a next step I highly >> recommend LaserGame tutorial >> http://squeak.preeminent.org/tut2007/html/ >> >> for which you'll should Squeak 3.9 (a predecessor to Pharo) >> http://ftp.squeak.org/3.9/ >> >> The great thing with this is it leads you through a uniquely Smalltalk >> approach to developing that is colloquially known as "developing from >> within the debugger" and it shows how to use Smalltalk facilities to >> refactor code as the design evolves. From the tutorial "Every step of the >> process is described in detail. Even when I made mistakes. The idea here is >> to show how natural it is to iterate over design and implementation and the >> confidence that builds with test driven development." >> >> This tutorial is one of the things that really hooked me into Smalltalk. >> >> cheers -ben >> >> >> >> >> > Thanks, this looks very interresting. And I think at first glance it can > be done on Pharo also. > > If I have enough knowlegde Im thinking about tryimg to make a sort of > repo-browser for the linux distro I work on. > But that will take a long time before I am at that point. > > Roelof > If you want to stretch the envelope, get a copy of this one: http://www.lulu.com/shop/andres-valloud/a-mentoring-course-on-smalltalk/pap… And make the exercises... You'll not be the same afterwards. Phil

March 31, 2014

Re: [Pharo-users] challenges

by Roelof Wobben

Ben Coman schreef op 31-3-2014 18:30: > Roelof Wobben wrote: >> Hello, >> >> I almost get book 1 ready. >> >> Now I wonder if there are challenges so I can practise more in Smaltalk. >> I know I learn the best by doing things and not just read about it. >> >> I like the most if the challenges can start at simple and get more >> complex . >> >> As example what I mean is 99 prolog/python problems >> >> Roelof >> >> >> > I'm not aware of anything similar. It does look interesting and > probably something that should be looked into further. > > Alternatively, sorry its not a challenge, but as a next step I highly > recommend LaserGame tutorial > http://squeak.preeminent.org/tut2007/html/ > > for which you'll should Squeak 3.9 (a predecessor to Pharo) > http://ftp.squeak.org/3.9/ > > The great thing with this is it leads you through a uniquely Smalltalk > approach to developing that is colloquially known as "developing from > within the debugger" and it shows how to use Smalltalk facilities to > refactor code as the design evolves. From the tutorial "Every step of > the process is described in detail. Even when I made mistakes. The > idea here is to show how natural it is to iterate over design and > implementation and the confidence that builds with test driven > development." > > This tutorial is one of the things that really hooked me into Smalltalk. > > cheers -ben > > > > Thanks, this looks very interresting. And I think at first glance it can be done on Pharo also. If I have enough knowlegde Im thinking about tryimg to make a sort of repo-browser for the linux distro I work on. But that will take a long time before I am at that point. Roelof

March 31, 2014

Re: [Pharo-users] challenges

by Ben Coman

Roelof Wobben wrote: > Hello, > > I almost get book 1 ready. > > Now I wonder if there are challenges so I can practise more in Smaltalk. > I know I learn the best by doing things and not just read about it. > > I like the most if the challenges can start at simple and get more > complex . > > As example what I mean is 99 prolog/python problems > > Roelof > > > I'm not aware of anything similar. It does look interesting and probably something that should be looked into further. Alternatively, sorry its not a challenge, but as a next step I highly recommend LaserGame tutorial http://squeak.preeminent.org/tut2007/html/ for which you'll should Squeak 3.9 (a predecessor to Pharo) http://ftp.squeak.org/3.9/ The great thing with this is it leads you through a uniquely Smalltalk approach to developing that is colloquially known as "developing from within the debugger" and it shows how to use Smalltalk facilities to refactor code as the design evolves. From the tutorial "Every step of the process is described in detail. Even when I made mistakes. The idea here is to show how natural it is to iterate over design and implementation and the confidence that builds with test driven development." This tutorial is one of the things that really hooked me into Smalltalk. cheers -ben

March 31, 2014

Re: [Pharo-users] Loop problem on Dr Stef

by Henrik Johansen

On 30 Mar 2014, at 1:45 , Roelof Wobben <r.wobben(a)home.nl> wrote: > Hello, > > When I select this part: > > 1 to: 100 do: > [:i | Transcript show: i asString; cr ]. > > And do print it. > > I only see 1 where I expected to see all the numbers from 1 till 100. > > What went wrong ? > > Roelof > > "print it" prints the return value of the expression. In the above case, that is the return value of the to:do: method, which is the receiver, so 1 is printed. (If you read the implementation of to:do: on Number, youâll see there is no explicit return using ^ , in such cases the return is always the receiver) If you wanted to print a list of 1 .. 100 (which would be printed with print it), youâd use a method which returns such a collection for example collect:; (1 to: 100) collect: [:each | each ]. The () are needed, since there is no to:collect: method, so instead we send collect: to an interval, which we create using 1 to: 100. Cheers, Henry

March 31, 2014

challenges

by Roelof Wobben

Hello, I almost get book 1 ready. Now I wonder if there are challenges so I can practise more in Smaltalk. I know I learn the best by doing things and not just read about it. I like the most if the challenges can start at simple and get more complex . As example what I mean is 99 prolog/python problems Roelof

March 31, 2014