October 2015 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Question when reading UPBE

by Dimitris Chloupis

Let me make this clear, I dont believe in stupid questions. Your first language , like me, is not English and so you have harder time to understand documentation. Coding nowdays is as much about learning English than is about learning how to code since its by far the most popular language that coders around the world use to communicate. So take it step by step and you will be fine. No next time you dont understand anything you come here and ask question. Ask a thousand questions, we love questions :) Do not suffer alone ! Now about your questions yes you understand correctly >> means "belongs to". Unfortunately there is a confusing part on the browser , the class button. The class button switches between something called instance side and class side. However this is confusing for newcomers like I was. What really happens is that it switches between the class object itself (instance side) and the metaclass object (class side). Metaclass is basically the class of a class. To make it clear if we accept here that a Class is a blueprint / factory for our instances , a metaclass is a blueprint/factory for a class. The diffirence if that you can have several instances from the same class but there is only one metaclass for a class. This happens for example when you issue the command in the Playground. LOGame new. The above command creates an instance object using the class object as a blueprint. But you can have one metaclass of a class , and this is why they share the same name and they appear to be each side of the same coin. Usually >> refers to the class itself and not the metaclass. No you dont need to type this as you can see. The diffirence is that if the method is in the metaclass (class side) you dont need to create an isntance fo. Lets take the example where cellsPerSide is a class method a = LOGame new a cellsPerSide we create a variable that hold the instance object created with LOGame class object and then we send the cellsPerSide message however what happens if the cellsPerSide is in the metaclass ? then we have this LOGame cellsPerSide as you can see no need to create instance here since its now a metaclass method. Usually you need a metaclass method when you dont need to operate on specific set of data and instance method when you do. Of course a metaclass method can still have arguments and receive data so this is far form clear rule. The real power of metaclass is that they can do metaprogramming, what that means is that they can shape and change classes from inside your code which makes them very powerful. You have also metaclass of a metaclass . As a matter of fact a metaclass is an instance of another metaclass. But you dont need to worry about this for now, keep it simple. On Tue, Oct 20, 2015 at 7:21 AM å°æ©æ© <zhushuai19890918(a)gmail.com> wrote: > You mean that I should type them in the pane of the method I want to > define, am I right? > then, which one should I type "LOGame>>cellsPerSide" or "cellsPerSide"? > Maybe this syntax --">>" just indicates that this method should belong to > this class. but as reader, I don't need to type all, do I ? > My English is poor and When I reader it a little faster, I will be > confused. Next time , if I encounter some sentences I don't understand, I > will read other sentences around them again. > Thx you all to spare time for my stupid questions :) > > 2015-10-20 2:02 GMT+08:00 Dimitris Chloupis <kilon.alios(a)gmail.com>: > >> have your read the Pharo Tour chapter ? >> >> please read the entire book from start to finish , DO NOT skip chapters >> this is a complete tutorial on Pharo that depends on previous chapters for >> continuation of knowledge. If you dont understand previous chapters you >> wont understand this. >> >> >> Your question is explained at Page 16, chapter: A quick tour of Pharo >> >> On Mon, Oct 19, 2015 at 6:50 PM å°æ©æ© <zhushuai19890918(a)gmail.com> wrote: >> >>> Hi, >>> >>> I'm a newcomer in Pharo and start to learn how to use Pharo. >>> In page 42 of UPBE(Vesion:2015-10-17 ), I don't know where I write >>> the constant methods and UPBE didn't tell me in which pane to type them. >>> Could you tell me ? >>> >>> Andy Zhu >>> >> >

Oct. 20, 2015

Re: [Pharo-users] Thanks for Pharo

by Marcus Denker

>> We (Doru and me) will write a new roadmap over the next weeksâ¦ so many things are happening, we need to get the current >> planning and how everything fits into one documentâ¦ >> >> Marcus > > Thank you both for doing this. It is a valuable asset to the community. It helps those of us who aren't driving the project to see where we are going and hopefully how we can help. > > Thank you both for all you do. I really enjoy your talk Nomads do not build Cathedrals. > https://www.youtube.com/watch?v=Vcoy5gwUvOA > Thanksâ¦ I was not quite sure back then if I should give a talk like thatâ¦ but in the end it worked, I think. I should do an iteration on itâ¦ I am collecting material about the topic, especially the feedback loopâ¦ It is so amazing that in a bootstrapping feedback loop, you do not need to reach perfection in each intermediate step to get the effects from the transient artefact to drive growth. Marcus

Oct. 20, 2015

Re: [Pharo-users] crashed image ?

by Marcus Denker

> On 20 Oct 2015, at 00:26, Jean Baptiste Arnaud <jbaptiste.arnaud(a)gmail.com> wrote: > > Hi, maybe a useful question :-) > > I crashed a image :-) > And I ask myself: > - There are a more advance (thinking bout maybe epicea) change browser ? Because a list of 1293801283 changes and just 1 options select all (which is broken you should use shortcut) will not really helpmeet We are in the process of integrating it. We tried saturday night, but the resulting update did not finish running all tests and we had to revert. > - Oz is usable on 5.0 image ? That can be the more efficient solution. Just want to stop some process. I exactly know what trigger the crash. And the "Igor hex tricksâ will not work here. > Export my code. > - why cannot drag a .change on another image anymore ? bug or choice ? > Bug. The registration mechanism was changed (and unified) to use pragmas. Normally all where ported over, but this seems to be missing. Marcus

Oct. 20, 2015

Re: [Pharo-users] Question when reading UPBE

by å°æ©æ©

You mean that I should type them in the pane of the method I want to define, am I right? then, which one should I type "LOGame>>cellsPerSide" or "cellsPerSide"? Maybe this syntax --">>" just indicates that this method should belong to this class. but as reader, I don't need to type all, do I ? My English is poor and When I reader it a little faster, I will be confused. Next time , if I encounter some sentences I don't understand, I will read other sentences around them again. Thx you all to spare time for my stupid questions :) 2015-10-20 2:02 GMT+08:00 Dimitris Chloupis <kilon.alios(a)gmail.com>: > have your read the Pharo Tour chapter ? > > please read the entire book from start to finish , DO NOT skip chapters > this is a complete tutorial on Pharo that depends on previous chapters for > continuation of knowledge. If you dont understand previous chapters you > wont understand this. > > > Your question is explained at Page 16, chapter: A quick tour of Pharo > > On Mon, Oct 19, 2015 at 6:50 PM å°æ©æ© <zhushuai19890918(a)gmail.com> wrote: > >> Hi, >> >> I'm a newcomer in Pharo and start to learn how to use Pharo. >> In page 42 of UPBE(Vesion:2015-10-17 ), I don't know where I write >> the constant methods and UPBE didn't tell me in which pane to type them. >> Could you tell me ? >> >> Andy Zhu >> >

Oct. 20, 2015

Re: [Pharo-users] Thanks for Pharo

by Offray Vladimir Luna CÃ¡rdenas

Hi, On 19/10/15 11:57, Dimitris Chloupis wrote: > The best way to thank us, is to contribute. So put your code where > your mouth is and give a much needed helping hand. Suggestions and > discussions is all good , but nothing beats old hard work ;) > > It can be a bug fix, a new library, a new gui tool, documentation, > blog posts or just promotion to other coder of the merits of pharo. It > does not matter how you will help only that you will do. > I think that mos of us are trying to thank in several ways, as you said. Cheers, Offray

Oct. 20, 2015

crashed image ?

by Jean Baptiste Arnaud

Hi, maybe a useful question :-) I crashed a image :-) And I ask myself: - There are a more advance (thinking bout maybe epicea) change browser ? Because a list of 1293801283 changes and just 1 options select all (which is broken you should use shortcut) will not really helpme - Oz is usable on 5.0 image ? That can be the more efficient solution. Just want to stop some process. I exactly know what trigger the crash. And the "Igor hex tricksâ will not work here. Export my code. - why cannot drag a .change on another image anymore ? bug or choice ? Best Regards JB jbaptiste.arnaud(a)gmail.com

Oct. 19, 2015

Re: [Pharo-users] Thanks for Pharo

by phil＠highoctane.be

I like the nuclear bomb image :-) On Mon, Oct 19, 2015 at 6:57 PM, Dimitris Chloupis <kilon.alios(a)gmail.com> wrote: > The best way to thank us, is to contribute. So put your code where your > mouth is and give a much needed helping hand. Suggestions and discussions > is all good , but nothing beats old hard work ;) > > It can be a bug fix, a new library, a new gui tool, documentation, blog > posts or just promotion to other coder of the merits of pharo. It does not > matter how you will help only that you will do. > > As stef says and I will agree very much "Pharo is yours" , its a project > that is unique and dares to go against the general practices and patterns > of modern coding and define its own path and do things its own way and > still boost productivity and be very useful. It looks like a simple toy on > the surface but screams "nuclear bomb" in the deep. But in the end it > depends on its own community to give the push it needs to keep going > forward and the more the better. > > On Mon, Oct 19, 2015 at 6:36 PM Offray Vladimir Luna CÃ¡rdenas < > offray(a)riseup.net> wrote: > >> Hi, >> >> Some notes below. >> >> On 19/10/15 08:39, Jimmie Houchin wrote: >> > >> > >> >>> >> >>> There truly is no edit, compile, run cycle similar to other >> >>> languages, even >> >>> dynamically typed languages with REPLs. >> >> I view that we do have an edit/compile/run loop, its just really >> >> tight loop! >> >> I recently had a passing thought we could market Pharo as REPL+. >> > >> > Here is what I was saying. In Pharo there is not separate tool for >> > editing, then a different tool for compiling and running. Yes, there >> > are distinct phases of process requiring editing, compiling and >> > running in Pharo, But they all exist in a single process. >> > >> > In Pharo I can have multiple Workspaces/Playgrounds and multiple Code >> > Browsers, Inspectors, Debuggers and Testing Tools all open at the same >> > time. I can flow from one to another and they all be viewing, editing, >> > executing, inspecting the same objects, instances. >> > >> > Where else can we have multiple editors, compilers, repls, and >> > whatever tools, all operating on the same objects and instances? >> > >> > As wonderful as Jupyter may be, can it have multiple windows with a >> > view into the same repl instance? Maybe? I don't know. But now throw >> > into that picture your favorite editor or IDE. Can it have multiple >> > files open and seamlessly edit the code running in that single repl >> > instance? The same instance as is in the Jupyter. >> > >> > Even if you get all of those tools communicating via sockets or >> > whatever to a single Python/Julia/??? instance. It is still a very >> > poor comparison to the workflow in any Smalltalk. >> > >> > Then you get to the end of your workday. There is no save menu to >> > persist the state of all of those tools and repl all working together. >> > >> > In Pharo, just one tool, Pharo. Everything exists inside Pharo. >> > Wonderful. >> > >> >> Talking about Jupyter/IPython, the portability and moldability of Pharo >> is something really empowering and difficult to find anywhere else >> (which doesn't diminish the advantages others' huge ecosystem, just we >> have different advantages). I wrote about my path from IPytho/Jupyter to >> Pharo in my over-publicized but under coded :-P project [1]: >> >> [1] >> >> http://mutabit.com/offray/static/blog/output/posts/grafoscopio-idea-and-ini… >> >> >> > >> > Absolutely. The already existent, persistent live environment is a >> > powerful thing. The fact that we have code in Pharo that is decades >> > old and has never been in a state disconnected from a live, running >> > environment is amazing. Where else do we find that? What other >> > software, programming language has a vision to provide such facility? >> > Most everything else is designed to build something which you release >> > and run. Release from your edit, build, compile to a run environment. >> > >> > Smalltalk and therefore Pharo is ontological and not merely a tool to >> > build something external to itself. This is a huge difference. >> > https://en.wikipedia.org/wiki/Ontology >> > >> > One of the things I find inspiring in the talks by Richard Hipp about >> > SQLite is the level of the quality of the code in SQLite. That its >> > file format is stable and guaranteed. That its codebase has complete >> > test coverage. Coverage sufficient for its use in avionics systems. >> > http://sqlite.org/testing.html >> > >> > I know Pharo is not going to be used in such a system. But it would be >> > interesting if we can have decent coverage on the core or kernel as >> > the everything get reduced to a buildable system. Then test coverage >> > can more easily be applied on a system which is smaller and >> > understandable. I have no concept of how you do the vm. >> > >> >> We could think on something like SQLite ubiquity for Pharo, not in the >> storage backend, but in the writing frontend (blogs, books, code >> snippets/scripts, data visualizations) with a portable "pocket >> infrastructure" (as I call it). Pharo is an awesome pocket >> infrastructure that can be run from a thumbdrive, computer sticker, low >> end server and anything between and beyond. And there are new scenarios, >> like open/citizen/garage science & research, activism, data journalims >> and others which lack of the proper tools for being really open, >> empowering and democratic and putting them exclusively on the "cloud" >> doesn't help that much. (A related idea on this track is on [2]) >> >> [2] >> >> https://www.newschallenge.org/challenge/data/entries/data-kitchen-frictionl… >> >> So which are the places where the empowerment that Pharo/Smalltalk >> brings will be ubiquitous? (I always take my custom Pharo with my keys >> thumb drive). >> >> Nice to see we can effectively explore/build the future together. >> >> Thanks, >> >> Offray >> >>

Oct. 19, 2015

[ANN] Mathex 0.3 is out! How hard would it be to give the possibility to use it with Pillar?

by Julien Delplanque

Hi all, I just released Mathex 0.3, you can look at the release note here [1] if you want. :) I wonder how hard it would be to give the possibility to write Mathex directly inside Pillar? Mathex provide pdf/png generation under Linux, so it is possible to create images for non-LaTeX Pillar's exportation. I would like to help to do this, if someone can give me some keys to do it I would appreciate :) Julien [1]: https://github.com/juliendelplanque/mathex/releases/tag/0.3

Oct. 19, 2015

Re: [Pharo-users] Voting for removing Seaside chapter from UPBE

by Stephan Eggermont

On 19-10-15 19:54, Dimitris Chloupis wrote: > I already mentioned this in Github issues but here is my take on this > > I vote for the complete removal of the Seaside chapter for several reasons > > a) Its not a beginner orientated chapter as is the focus of this book I just took a look. It definitely is a beginner oriented chapter. > b) its not general purpose as is the focus of this book I'm afraid building web applications should be considered general purpose these days. And Seaside provides a very simple way to quickly build well-structured complex web applications. > c) far harder to keep this updated constantly which again is the focus of > this book, since not many of us use seaside Hmm. It is very easy to keep updated, as Seaside is very stable. I don't know how many people on this list are currently using Seaside, but a very large part of them have used Seaside. > e) Its not even part of Pharo standard distribution Hey! Finally we have some code that can be safely loaded and unloaded... Stephan

Oct. 19, 2015

Re: [Pharo-users] Question when reading UPBE

by Dimitris Chloupis

have your read the Pharo Tour chapter ? please read the entire book from start to finish , DO NOT skip chapters this is a complete tutorial on Pharo that depends on previous chapters for continuation of knowledge. If you dont understand previous chapters you wont understand this. Your question is explained at Page 16, chapter: A quick tour of Pharo On Mon, Oct 19, 2015 at 6:50 PM å°æ©æ© <zhushuai19890918(a)gmail.com> wrote: > Hi, > > I'm a newcomer in Pharo and start to learn how to use Pharo. > In page 42 of UPBE(Vesion:2015-10-17 ), I don't know where I write the > constant methods and UPBE didn't tell me in which pane to type them. > Could you tell me ? > > Andy Zhu >

Oct. 19, 2015