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Re: [Pharo-users] difference between double dispatch and the method explains here

by Roelof Wobben

Op 6-4-2019 om 15:15 schreef K K Subbu: > On 06/04/19 4:49 PM, Roelof Wobben wrote: >> Hello, >> >> I just learned double dispatch. >> And now for the Robot challenge of exercism Tim has pointed me to >> this >> article(https://blog.metaobject.com/2019/04/accessors-have-message-obsessio… >> >> but I fail to see how the move method looks like in that article. >> I had a conversation with Tim in the exercism channel and the way he >> explains it, it looks like double dispatch for me. >> >> Am I on the right track or do I oversee something here. > unary methods like moveRight perform specific ops and are not > parametric, so only a single dispatch, depending on the receiver, is > needed. > > If you change it to move: aDistanceOrAngle, then performing requests > like "move: 3 cms" or "move: 30 degrees" will depend not only on the > receiver but also on the class of the argument. This would need double > dispatch (aka multiple polymorphism). The first dispatch would be > based on the receiver and the receiver's method would then dispatch it > based on the class of the argument (i.e. Distance>>move or Angle>>move ) > > HTH .. Subbu > > hmm, still stuck I have now a class Direction with as instance variables north, south, east, west and made the accessors. then I thought I need a initialize like this : initialize Â Â north = Direction( 0, -1). Â Â eastÂ = Direction( 1,Â 0). Â Â south = Direction( 0,Â 1). Â Â westÂ = Direction(-1,Â 0). but the Direction (0,-1)Â is a problem . the compiler does not like the (0,-1) part to give you the big picture. I have a Robot which can turnRight , turnLeft and moveForward and I try to understand how the page would work in my case. So I have a object Direction as described above and a Object MoveForward which is a subobject of Direction. MoveForward has only 1 method : IsMove Â Â ^Â 'A' Roelof

April 7, 2019

Re: [Pharo-users] Iceberg for files other than code?

by Tim Mackinnon

My understanding is that at the moment commits are restricted to whatâs I the designated src directory, so you need to use an external way to commit non code files into your branch. These can be 1. Git cmd line 2. Another tool like IntelliJ 3. The github web bowser If you do, you need to pull or merge in Pharo to keep things in sync. I also hope one day we might widen the scope to commit more things directly in Pharo - particularly the readme ir other config files (I gave the same problem with exercism ) Tim Sent from my iPhone > On 6 Apr 2019, at 22:45, Christopher Fuhrman <christopher.fuhrman(a)gmail.com> wrote: > > Hi Konrad, > >> On Sat, 6 Apr 2019 at 15:46, Konrad Hinsen <konrad.hinsen(a)fastmail.net> wrote: >> Hi everyone, >> >> Is it possible to read and modify files not containing Pharo code in a >> repository managed by Iceberg? I am thinking of reading the repository's >> README file, for example, or storing data files read by my code >> alongside the code itself. > > I'm not sure if you are referring to GitHub's README, but if you are, I maintain my project's README on GitHub's web site (which requires care if you're using branches). I like the markdown preview there which requires no fancy software installed on my PC. You need to pull the change to Iceberg. > > There's indeed a copy of the README.md in my image's pharo-local/iceberg/GITHUBUSERNAME/GITHUBPROJECT directory, and I can even modify it using Pharo 7's File Browser. However, any modifications to it are not seen or committed by Iceberg (at least I don't know of a way to make that happen). I believe Iceberg's change detection is limited to the smalltalk files in the packages that are in the repositories it knows about. But I'm still far from an expert with this. Hopefully a more qualified person can confirm. > > There's theoretically a way to run a git client outside of Pharo that knows about the local git repo that Iceberg's using, so maybe you can commit the non-Pharo files that way. However, doing that is sure to cause a "detached" state with the repo in the image. That is not a catastrophic problem, but it's more accidental complexity to deal with. I picked my battles and maintain README on GitHub. > > Christopher > >> >> Konrad. >> > > > -- > Christopher Fuhrman, P.Eng, PhD > Professor in the DÃ©partement of Software and IT Engineering > ÃTS (Ãcole de technologie supÃ©rieure) > > http://profs.etsmtl.ca/cfuhrman > +1 514 396 8638 > L'ÃTS est une constituante de l'UniversitÃ© du QuÃ©bec > Confidentiality Notice > This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify christopher.fuhrman(a)etsmtl.ca. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. > Avis de confidentialitÃ© > L'information contenue dans ce message Ã©lectronique ainsi que dans les fichiers qui peuvent y Ãªtre attachÃ©s est de nature confidentielle et destinÃ©e Ã l'usage exclusif du destinataire. Si ce message vous est parvenu par erreur ou que vous n'Ãªtes pas le destinataire visÃ©, vous Ãªtes par la prÃ©sente avisÃ© que tout usage, copie ou distribution de l'information contenue dans ce message est strictement interdit et vous Ãªtes priÃ© d'en aviser christopher.fuhrman(a)etsmtl.ca et de dÃ©truire ce message.

April 6, 2019

Re: [Pharo-users] Iceberg for files other than code?

by Christopher Fuhrman

Hi Konrad, On Sat, 6 Apr 2019 at 15:46, Konrad Hinsen <konrad.hinsen(a)fastmail.net> wrote: > Hi everyone, > > Is it possible to read and modify files not containing Pharo code in a > repository managed by Iceberg? I am thinking of reading the repository's > README file, for example, or storing data files read by my code > alongside the code itself. > I'm not sure if you are referring to GitHub's README, but if you are, I maintain my project's README on GitHub's web site (which requires care if you're using branches). I like the markdown preview there which requires no fancy software installed on my PC. You need to pull the change to Iceberg. There's indeed a copy of the README.md in my image's pharo-local/iceberg/GITHUBUSERNAME/GITHUBPROJECT directory, and I can even modify it using Pharo 7's File Browser. However, any modifications to it are not seen or committed by Iceberg (at least I don't know of a way to make that happen). I believe Iceberg's change detection is limited to the smalltalk files in the packages that are in the repositories it knows about. But I'm still far from an expert with this. Hopefully a more qualified person can confirm. There's theoretically a way to run a git client outside of Pharo that knows about the local git repo that Iceberg's using, so maybe you can commit the non-Pharo files that way. However, doing that is sure to cause a "detached" state with the repo in the image. That is not a catastrophic problem, but it's more accidental complexity to deal with. I picked my battles and maintain README on GitHub. Christopher > Konrad. > > -- Christopher Fuhrman, P.Eng, PhD *Professor in the DÃ©partement of Software and IT EngineeringÃTS (Ãcole de technologie supÃ©rieure)* http://profs.etsmtl.ca/cfuhrman +1 514 396 8638 *L'ÃTS est une constituante de l'UniversitÃ© du QuÃ©bec* *Confidentiality Notice* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify christopher.fuhrman(a)etsmtl.ca. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. *Avis de confidentialitÃ©* L'information contenue dans ce message Ã©lectronique ainsi que dans les fichiers qui peuvent y Ãªtre attachÃ©s est de nature confidentielle et destinÃ©e Ã l'usage exclusif du destinataire. Si ce message vous est parvenu par erreur ou que vous n'Ãªtes pas le destinataire visÃ©, vous Ãªtes par la prÃ©sente avisÃ© que tout usage, copie ou distribution de l'information contenue dans ce message est strictement interdit et vous Ãªtes priÃ© d'en aviser christopher.fuhrman(a)etsmtl.ca et de dÃ©truire ce message.

April 6, 2019

Re: [Pharo-users] difference between double dispatch and the method explains here

by Roelof Wobben

April 6, 2019

Iceberg for files other than code?

by Konrad Hinsen

Hi everyone, Is it possible to read and modify files not containing Pharo code in a repository managed by Iceberg? I am thinking of reading the repository's README file, for example, or storing data files read by my code alongside the code itself. Konrad.

April 6, 2019

Re: [Pharo-users] difference between double dispatch and the method explains here

by K K Subbu

On 06/04/19 4:49 PM, Roelof Wobben wrote: > Hello, > > I just learned double dispatch. > And now for the Robot challenge of exercism Tim has pointed me to this > article(https://blog.metaobject.com/2019/04/accessors-have-message-obsessio… > > but I fail to see how the move method looks like in that article. > I had a conversation with Tim in the exercism channel and the way he > explains it, it looks like double dispatch for me. > > Am I on the right track or do I oversee something here. unary methods like moveRight perform specific ops and are not parametric, so only a single dispatch, depending on the receiver, is needed. If you change it to move: aDistanceOrAngle, then performing requests like "move: 3 cms" or "move: 30 degrees" will depend not only on the receiver but also on the class of the argument. This would need double dispatch (aka multiple polymorphism). The first dispatch would be based on the receiver and the receiver's method would then dispatch it based on the class of the argument (i.e. Distance>>move or Angle>>move ) HTH .. Subbu

April 6, 2019

difference between double dispatch and the method explains here

by Roelof Wobben

Hello, I just learned double dispatch. And now for the Robot challenge of exercism Tim has pointed me to this article(https://blog.metaobject.com/2019/04/accessors-have-message-obsessio… but I fail to see how the move method looks like in that article. I had a conversation with Tim in the exercism channel and the way he explains it, it looks like double dispatch for me. Am I on the right track or do I oversee something here. Roelof

April 6, 2019

can I do something like this with Double Dispatch

by Roelof Wobben

Hello, Just thinking how to solve the bowling challenge from exercism. but I wonder if I can do something like this in the method that checks if I have the right object I was thinking about this : Result -- Strike -- Spare -- allOther then InÂ Strike something like this checkForBonus: number1 score2: number2 Â ^ number1 + number2 == 10 or am I thinking the totally wrong way to solve this? Roelof

April 6, 2019

Re: [Pharo-users] Advanced preferences for Pharo

by Cyril Ferlicot

On Fri 5 Apr 2019 at 16:41, Tim Mackinnon <tim(a)testit.works> wrote: > Thanks Cyril - lots of great ideas, thanks for sharing. > > Top tip I took away - use a meta link to replace a method for non > configurable stuff because this way you donât contaminate any potential pr > submissions (neat idea). > Most of the time I try to contribute it to Pharo, but sometimes it just make sense only for my personal taste :) > Tim > > Sent from my iPhone > > > On 5 Apr 2019, at 15:34, Cyril Ferlicot <cyril.ferlicot(a)gmail.com> > wrote: > > > > Hi, > > > > At PharoDays I presented how I am managing my preferences in Pharo in > > a more advanced way than using the preferences browser. (Because I do > > not want to be limited to the pre-defined settings) > > > > I am using a classic pharo project managed with Metacello that I load > > via a startup script to execute and add code. > > > > If some of you want to check how I am doing it, you can check the code > > at https://github.com/jecisc/pharo-scripts > > > > -- > > Cyril Ferlicot > > https://ferlicot.fr > > > > > -- Cyril Ferlicot https://ferlicot.fr

April 5, 2019

Re: [Pharo-users] Advanced preferences for Pharo

by Tim Mackinnon

Thanks Cyril - lots of great ideas, thanks for sharing. Top tip I took away - use a meta link to replace a method for non configurable stuff because this way you donât contaminate any potential pr submissions (neat idea). Tim Sent from my iPhone > On 5 Apr 2019, at 15:34, Cyril Ferlicot <cyril.ferlicot(a)gmail.com> wrote: > > Hi, > > At PharoDays I presented how I am managing my preferences in Pharo in > a more advanced way than using the preferences browser. (Because I do > not want to be limited to the pre-defined settings) > > I am using a classic pharo project managed with Metacello that I load > via a startup script to execute and add code. > > If some of you want to check how I am doing it, you can check the code > at https://github.com/jecisc/pharo-scripts > > -- > Cyril Ferlicot > https://ferlicot.fr >

April 5, 2019