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Re: [Pharo-users] eval from the linux commandline

by Steve Quezadas

is it part of the base image? It's not listed in spotter. I also checked the packages for something beginning with Clap and it's not there either. I am also running linux, so "eval" is not an option in my commandline. On Sun, Mar 24, 2019 at 12:06 PM Alistair Grant <akgrant0710(a)gmail.com> wrote: > On Sun, 24 Mar 2019 at 00:54, test email <steveeq1(a)gmail.com> wrote: > > > > i need to eval an object from my linux commandline. I understand that > clap-st is able to do this, but I can't seem to import it into pharo7, I > suppose because of compatability reasons. > > Clap is now part of the base image, so you should be able to just > download the latest image and use it "out of the box". > > Cheers, > Alistair > >

March 25, 2019

Re: [Pharo-users] how to get out of this mess

by Roelof Wobben

March 25, 2019

Re: [Pharo-users] how to get out of this mess

by Richard O'Keefe

In OOP, you should not be thinking in terms of "updating a record". You should *ask* an object to update *itself*. [aStream atEnd] whileFalse: [ |fields team1 team2 outcome| fields := aStream nextLine subStrings: ';'. team1 := self teamNamed: (fields at: 1). team2 := self teamNamed: (fields at: 2). outcome := fields at: 3. outcome = 'win' ifTrue: [team1 won. team2 lost]. outcome = 'draw' ifTrue: [team1 tied. team2 tied]. outcome = 'loss' ifTrue: [team1 lost. team2 won ]]. (Extracted from a working solution.) On Mon, 25 Mar 2019 at 19:29, Roelof Wobben <r.wobben(a)home.nl> wrote: > Thanks all > > @Richard > > I did tried that way in the solution I put on the net. > But I get stuck at the point that if I update a record in the Team Class > the collection at the Tournament class was not updated. > > But right now , I try a new way to make it work that a new team is made > and returned or a team is returned if that team is known. > > Roelof > > > > Op 25-3-2019 om 06:18 schreef Richard O'Keefe: > > This is a simple programming-contest sort of exercise. > You "need" only two classes. > + a Team > - knows its name (a String of at most 30 characters) > * This should be passed when the Team is created; > the rest of the program should NOT call (Team new) > and should NEVER see an un#initialize-d Team instance. > - knows the number of matches it has won, drawn, and lost > (non-negative Integers, initially zero). > - can report what it knows > - can report the total match count and point score > - can be told that it has won, drawn, or lost another match. > > + a Tournament > - has a collection of Teams that it knows by name > (a Dictionary) > - and an sequence, initially undefined. > - can read a set of match triples from a stream, > forwarding the information about wins, draws, and losses > to Team instances, which are created when a new name is found, > - can convert the values of the teams collection to a > sorted collection that is sorted by a somewhat vague order, > I chose > - descending on point score, then > - descending on wins, then > - ascending on losses, then > - ascending on name. > - can write the sorted teams to a stream in tabular form. > ! Has a class method that does > (self new) read: <<source>>; sort; write: <<destination>> > > Frankly, formatting the output was the hardest part. > > On Mon, 25 Mar 2019 at 10:00, Roelof Wobben <r.wobben(a)home.nl> wrote: > >> hello, >> >> I think I have to reconsider my classes and reponsibilities >> >> Right now Im thinking of this >> >> Team : responsinble for team properties >> Ranking : reponsibilities for checking if a team is in the ranking and >> updating the team statics >> Tournament : parsing the ganes and call the right functions on Ranking >> >> Can this work or am In making to much classes >> >> Roelof >> >> >> >> >> Op 24-3-2019 om 19:02 schreef Roelof Wobben: >> > Hello, >> > >> > I tried another way to solve this but the code is a mess now. >> > >> > I can update a record but the record is not updated. >> > And I have to do a lot of the same steps for every team. >> > >> > Anyone who can help me to get out of this mess. >> > >> > Code so far: https://github.com/RoelofWobben/tournament >> > >> > Roelof >> > >> > >> > >> >> >> >

March 25, 2019

Re: [Pharo-users] how to get out of this mess

by Roelof Wobben

March 25, 2019

Re: [Pharo-users] how to get out of this mess

by Richard O'Keefe

This is a simple programming-contest sort of exercise. You "need" only two classes. + a Team - knows its name (a String of at most 30 characters) * This should be passed when the Team is created; the rest of the program should NOT call (Team new) and should NEVER see an un#initialize-d Team instance. - knows the number of matches it has won, drawn, and lost (non-negative Integers, initially zero). - can report what it knows - can report the total match count and point score - can be told that it has won, drawn, or lost another match. + a Tournament - has a collection of Teams that it knows by name (a Dictionary) - and an sequence, initially undefined. - can read a set of match triples from a stream, forwarding the information about wins, draws, and losses to Team instances, which are created when a new name is found, - can convert the values of the teams collection to a sorted collection that is sorted by a somewhat vague order, I chose - descending on point score, then - descending on wins, then - ascending on losses, then - ascending on name. - can write the sorted teams to a stream in tabular form. ! Has a class method that does (self new) read: <<source>>; sort; write: <<destination>> Frankly, formatting the output was the hardest part. On Mon, 25 Mar 2019 at 10:00, Roelof Wobben <r.wobben(a)home.nl> wrote: > hello, > > I think I have to reconsider my classes and reponsibilities > > Right now Im thinking of this > > Team : responsinble for team properties > Ranking : reponsibilities for checking if a team is in the ranking and > updating the team statics > Tournament : parsing the ganes and call the right functions on Ranking > > Can this work or am In making to much classes > > Roelof > > > > > Op 24-3-2019 om 19:02 schreef Roelof Wobben: > > Hello, > > > > I tried another way to solve this but the code is a mess now. > > > > I can update a record but the record is not updated. > > And I have to do a lot of the same steps for every team. > > > > Anyone who can help me to get out of this mess. > > > > Code so far: https://github.com/RoelofWobben/tournament > > > > Roelof > > > > > > > > >

March 25, 2019

Re: [Pharo-users] how to get out of this mess

by Benoit St-Jean

Hi Roelof, I probably missed your prior posts but I do have a few questions and/or comments for you before I can be of any help! This code is for tournaments of what sport exactly?Â Hockey teams?Â Baseball teams?Â Or tournaments between players (such as in chess where the concept of Team exists only every 4 years for the chess Olympiads).Â Do you plan on handling different sports? Different tournament formats (round robin, ladder, etc). The whole thing seems to be centered around games/match results but you don't have such a class in your example.Â Besides, how do you handle different results for one team for the same tournament a few years apart (say, the 2017 Formula 1 season vs the 2018 Formula 1 season) ?Â Shouldn't tournaments also have a name and a year (or a Season object) like they have in tennis, golf, chess, hockey, baseball, etc? So my first impression is that you need the following classes : Team, GameResult, Tournament and something like TournamendDirector to create tournaments and create matches (or read/write them). In other words, we need more info on what you are trying to do! On 2019-03-24 14:02, Roelof Wobben wrote: > Hello, > > I tried another way to solve this but the code is a mess now. > > I can update a record but the record is not updated. > And I have to do a lot of the same steps for every team. > > Anyone who can help me to get out of this mess. > > Code so far:Â https://github.com/RoelofWobben/tournament > > Roelof > > -- ----------------- BenoÃ®t St-Jean Yahoo! Messenger: bstjean Twitter: @BenLeChialeux Pinterest: benoitstjean Instagram: Chef_Benito IRC: lamneth GitHub: bstjean Blogue: endormitoire.wordpress.com "A standpoint is an intellectual horizon of radius zero". (A. Einstein)

March 25, 2019

Re: [Pharo-users] How cn I improve this code

by Richard O'Keefe

Four blindingly obvious remarks. (1) Where are the comments? What problem is this actually solving? Where is the specification? Oh, it's at the *end*, not actually in the Team class. (2) name: anObject name := anObject and way too many methods like it. (a) Saying "anObject" is maximally unhelpful. It's even worse than "s" because that might be a clue that it is a string or symbol. You might want to read the (now free) book "Smalltalk with Style". (b) I dislike "setter" methods that let anyone poke absolutely anything into your object. For example, supposing that name should be a string -- which is the kind of information that should go in a class comment -- I tend to write methods like this as name: aString name := aString asString. which either puts a string into name or dies trying. In fact, I would have an instance cra (3) When I saw "matchplayed matchtied matchlost" I initially expected them to be Boolean. It would really help if you had a class comment saying what they are (and what they mean) and/or an 'initialize' method that sets them to 0. Furthermore, these things are counts, so in English would have to be matchesPlayed, matchesTied, matchesWon, matchesLost. But even that is misleading; you might think they were containers holding Match objects. So I would suggest winCount lossCount tieCount and totalCount ^winCount + lossCount + tieCount making it *impossible* for totalCount to disagree with the others. (4) Code like aTeam matchwon: aTeam matchwon + 1. aTeam points: aTeam points + 3. really doesn't treat aTeam like an object. We note that there are 3 points for a win 1 point for a tie 0 points for a loss and realise that we can do totalPoints ^winCount * 3 + tieCount gotWin winCount := winCount + 1. and now we have aTeam gotWin. The rule here is "if you want an object to change state, ASK THE OBJECT TO DO IT." On Sun, 24 Mar 2019 at 05:12, Roelof Wobben <r.wobben(a)home.nl> wrote: > Hello, > > As a challenge I had to write some code that makes ranks from a > competition. > Im still busy trying to find out how to model this problem. > > Right now I have made the code I included and I wonder how I can improve > this code before I go on with this way. > > Roelof > >

March 25, 2019

Re: [Pharo-users] What oo/modelling books/articles do we recommend these days?

by Christopher Fuhrman

On Sun, 24 Mar 2019 at 21:26, Tim Mackinnon <tim(a)testit.works> wrote: > Any good references come to mind? As Iâll build up a list that I can point > people to, that hopefully puts them in a better place to solve these more > interesting and hopefully rewarding problems. > Since 2003 in one of my courses I've used Craig Larman's Applying UML and Patterns because it has an analysis approach (getting from a semi-complex problem to a working OO solution in iterations, with UML if you want). It's using the Point Of Sale (cash register) problem which is complex yet familiar enough for most people to grasp (no pun intended, GRASP are the patterns he pushes as underlying responsibility-driven principles). Otherwise, Cay Horstmann's 3rd edition of OO Design and Patterns (Java, but applies to any OO language) should be out soon (I provided feedback on a draft copy last year). It has some good coverage of OO qualities and also uses a realistic problem (Graphics Editing framework, Violet) as the basis of lots of examples.

March 24, 2019

Re: [Pharo-users] how to get out of this mess

by Roelof Wobben

hello, I think I have to reconsider my classes and reponsibilities Right now Im thinking of this Team :Â responsinble for team properties Ranking : reponsibilitiesÂ for checking if a team is in the ranking and updating the team statics Tournament :Â parsing the ganes and call the right functions on Ranking Can this work or am In making to much classes Roelof Op 24-3-2019 om 19:02 schreef Roelof Wobben: > Hello, > > I tried another way to solve this but the code is a mess now. > > I can update a record but the record is not updated. > And I have to do a lot of the same steps for every team. > > Anyone who can help me to get out of this mess. > > Code so far:Â https://github.com/RoelofWobben/tournament > > Roelof > > >

March 24, 2019

What oo/modelling books/articles do we recommend these days?

by Tim Mackinnon

As I see Exercism students grapple with more realistic problems which are less algorithmic and more potentially OO (in this case - https://github.com/exercism/pharo-smalltalk/blob/master/dev/src/Exercism/To… <https://github.com/exercism/pharo-smalltalk/blob/master/dev/src/Exercism/To…> ), I am wondering what we point people towards to learn about OO, identifying objects and more importantly responsibilities these days? There is the early Beck CRC paper - but looking at it again, I wonder if its a bit cursory for people who missed the whole OO discovery years ago, and are now faced with competing advice on how to write good programs (much of which seems to eschew OO these days - rather unfairly I think). Any good references come to mind? As Iâll build up a list that I can point people to, that hopefully puts them in a better place to solve these more interesting and hopefully rewarding problems. Tim Sent from my iPhone

March 24, 2019