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

Re: [Pharo-users] I Can Read C++ and Java But I Can't Read Smalltalk

by kilon alios

Smalltalk is the easiest language I have learned so far. Python coming second and quite close. I also find Squeak by Example and Pharo by Example very good introductory guides. Smalltalk By Example is even better if you want to know more about the language. Smalltalk is similar to Lisp in the sense that it follows its own path and it takes some time to escape the C syntax. But overall Smalltalk and Lisp are excellent choices for beginner coders. The article you linked contains those peculiarities but those things will become apparent to anyone following Pharo by Example. And I dont think you will find many people arguing that C++ , Java are more readable than Smalltalk and Lisp. Sure to people that are not that experienced could be. But even in that case, I dont quite believe it. Overall however learning languages is not a big deal, its learning libraries that can become a real torture. For example I hated C++ because of MFC and I strongly disliked Java because of Swing. Now that I am learning Javascript , I dislike it because of DOM , Jquery etc . Also Its easy to find good documentation for languages much more difficult for libraries. So I am not buying that Smalltalk is anything else than very easy to learn. Other than that like any language out there it takes some time to get used to some things. On Sun, Mar 30, 2014 at 9:04 PM, Ben Coman <btc(a)openinworld.com> wrote: > I came across this article a few days ago. Thought it might be of > interest to some. > http://www.eli.sdsu.edu/courses/spring01/cs635/readingSmalltalk.pdf > >

March 30, 2014

Re: [Pharo-users] still failing test

by Roelof Wobben

Ben Coman schreef op 30-3-2014 20:12: > Roelof Wobben wrote: >> Hello, >> >> I trying to make the make you own method work. >> >> So I first I added this : >> >> testShout >> self assert: ('Don''t panic' shout = 'DON""T PANIC!') >> >> After that I added this as described in the book. >> shout >> ^ self asUppercase. "!" >> >> But still the testrunner gives that there is a failing test on >> testShout. >> >> Roelof >> >> >> > Rather than just feed you a fish, a little teaching how to fish :) > I would highlight and Inspect each side of the equals sign - so you > can look at each string next to the other. Two things to think about: > * commas versus periods > * different types of quote marks > I'll follow up with the answer in the next post. > cheers -ben > > Oke, I do not see it I have now this : self assert: ('Dont panic!' shout = 'DONT PANIC!') and for me it looks the same and still the test is failing. and the other part has changed to ^ self asUppercase, '!' Roelof

March 30, 2014

Re: [Pharo-users] still failing test

by Ben Coman

Roelof Wobben wrote: > Hello, > > I trying to make the make you own method work. > > So I first I added this : > > testShout > self assert: ('Don''t panic' shout = 'DON""T PANIC!') > > After that I added this as described in the book. > shout > ^ self asUppercase. "!" > > But still the testrunner gives that there is a failing test on testShout. > > Roelof > > > Rather than just feed you a fish, a little teaching how to fish :) I would highlight and Inspect each side of the equals sign - so you can look at each string next to the other. Two things to think about: * commas versus periods * different types of quote marks I'll follow up with the answer in the next post. cheers -ben

March 30, 2014

Re: [Pharo-users] still failing test

by Sergi Reyner

2014-03-30 18:55 GMT+01:00 Roelof Wobben <r.wobben(a)home.nl>: > testShout > self assert: ('Don''t panic' shout = 'DON""T PANIC!') > You properly doubled the single quote inside the first string. However, you used two double quotes inside the second string; replace them with two single quotes. You also have an exclamation sign in the second string which is not in the first one. Remove it and the test will pass. Note that the exclamation mark in the following method is inside a comment: After that I added this as described in the book. > shout > ^ self asUppercase. "!" > This is fine. The ending period is not needed, though. Periods work as statement separators in Smalltalk, not terminators as semicolons in C, for example. If you really want to have an exclamation mark added to the string, you should implement shout as this: shout ^ self asUppercase , '!' Cheers, Sergi

March 30, 2014

I Can Read C++ and Java But I Canât Read Smalltalk

by Ben Coman

I came across this article a few days ago. Thought it might be of interest to some. http://www.eli.sdsu.edu/courses/spring01/cs635/readingSmalltalk.pdf

March 30, 2014

Re: [Pharo-users] writing my own method problem .

by Ben Coman

Roelof Wobben wrote: > Esteban Lorenzano schreef op 30-3-2014 16:31: >> you are using a dot: >> >> self DOT assert: is wrong syntax. >> >> you need just a space: >> >> self assert: >> >> Esteban >> >> On 30 Mar 2014, at 11:26, Roelof Wobben <r.wobben(a)home.nl> wrote: >> >>> Hello, >>> >>> I have to make my own method but when I enter this: >>> >>> testShout >>> self.assert: ( 'Do not panic' shout = "DO NO PANIC") >>> >>> The editor makes this : >>> >>> testShout >>> self. Nothing more expected ->assert: ( 'Do not panic' shout = "DO >>> NO PANIC") >>> >>> And I do not get a message that shout does not exist. >>> >>> Roelof >>> >>> >> >> > > Thanks, > it worked, > Now a problem with the arrow above. > According to the manual I have to type ^). > But then I see the same error message as above. > > Roelof > > Happy to help* if you can give the whole line, or a page and a line number from PBE. Otherwise its shooting in the dark trying to guess what you need. cheers -ben *except I'm off to bed right now - but I'm sure that with that info someone else can chime in.

March 30, 2014

still failing test

by Roelof Wobben

Hello, I trying to make the make you own method work. So I first I added this : testShout self assert: ('Don''t panic' shout = 'DON""T PANIC!') After that I added this as described in the book. shout ^ self asUppercase. "!" But still the testrunner gives that there is a failing test on testShout. Roelof

March 30, 2014

Re: [Pharo-users] writing my own method problem .

by Sergi Reyner

2014-03-30 15:26 GMT+01:00 Roelof Wobben <r.wobben(a)home.nl>: > testShout > self. Nothing more expected ->assert: ( 'Do not panic' shout = "DO NO > PANIC") > There are some things wrong with the second line: - thereÂ´s a period after self, you must remove it - you wrote NO instead of NOT, so the the assert will fail - the sentence in capitals is surrounded by double quotes $" which are for comments; strings are surrounded by single quotes $' , this makes your code actually be: ( 'Do not panic' shout = ) To write the return operator, ^, I can use one of these two combinations in my linux box (which has a slightly weird US international keyboard layout): - press shift+6 twice - press shift+6, then press space As an additional note, you donÂ´t actually need the parentheses there, because the order of evaluation is: - unary messages (#shout) - binary messages (#=) - keyword messages (#assert:) So you can write: testShout ^ self assert: 'do not panic' shout = 'DO NOT PANIC' Hope this helps in getting a better grasp of Smalltalk syntax. I found it really easy and fun to learn :) Cheers, Sergi

March 30, 2014

Re: [Pharo-users] writing my own method problem .

by Roelof Wobben

Esteban Lorenzano schreef op 30-3-2014 16:31: > you are using a dot: > > self DOT assert: is wrong syntax. > > you need just a space: > > self assert: > > Esteban > > On 30 Mar 2014, at 11:26, Roelof Wobben <r.wobben(a)home.nl> wrote: > >> Hello, >> >> I have to make my own method but when I enter this: >> >> testShout >> self.assert: ( 'Do not panic' shout = "DO NO PANIC") >> >> The editor makes this : >> >> testShout >> self. Nothing more expected ->assert: ( 'Do not panic' shout = "DO NO PANIC") >> >> And I do not get a message that shout does not exist. >> >> Roelof >> >> > > Thanks, it worked, Now a problem with the arrow above. According to the manual I have to type ^). But then I see the same error message as above. Roelof

March 30, 2014

Re: [Pharo-users] How to draw a Morph with Athens?

by MartinW

Igor Stasenko wrote > u you u no draw morphs by athens :) > > - use AthensWrapMorph. > put as many submorphs into it, and they all will be drawn via Athens. > eventually, the need in wrap morph will disappear once WorldMorph (the > root > of all morphs) start using Athens directly. Ok, thank you, that's nice. What is the intended use - subclass AthensWrapMorph instead of Morph for my own Morphs, or make my Morphs subclasses of Morph as usual and always create a AthensWrapMorph and then add them as submorphs? M. -- View this message in context: http://forum.world.st/How-to-draw-a-Morph-with-Athens-tp4751463p4751715.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

March 30, 2014