Re: [Pharo-users] mentor wanted
--- Begin Message --- Op 26-4-2020 om 06:30 schreef Richard O'Keefe: Roelof, *I* was offering to write something. On Sat, 25 Apr 2020 at 19:47, Roelof Wobben via Pharo-users wrote: Op 25-4-2020 om 08:30 schreef Richard Sargent: On Fri, Apr 24, 2020, 22:25 Richard O'Keefe wrote: Roelof, I don't think CRC cards or the GRASP patterns or anything like that addresses your immediate needs. Based on other questions of yours it seems to me that your problem is not *organising* the responsibilities in an OO program, but decomposing a problem into responsibilities in the first place. I think this is perhaps the most important part of programming, and the hardest to learn, not least because very few of us are good at teaching it. We're not very good at teaching it in mathematics either. I do not think your issues are anything to do with Pharo, Smalltalk, OOP, or programming as such. One symptom of the general problem that I've noticed is that I see code as a very fluid sort of thing where pieces can be moved around and recombined, while many people think of code as something solid and rather brittle. I was thinking of writing up a short description of what I was thinking for a RosettaCode example anyway. Would that help? Thank you, Richard. I appreciate your offering this. I am not a teacher, so your help is truly appreciated! Moment, I have to look if I understand you right. I think you have some strong points but the last one I did not understand well. Do I have to write for example for a exercism challenge a short description of that problem like people do with rosetta code challenges and example code ? Roelof oke, I also accept this offer also. The more angles I learn to solve this , the more I can use that in later challenges. and if I understand everything right , the solution is very simple linksTowards: anAddress do: aBlock "Simple flood algorithm: route via all outgoing links. However, just loopback if the receiver node is the routing destination." address = anAddress ifTrue: [ aBlock evaluate: loopback ] ifFalse: [ outgoingLinks do: aBlock ] and the flow is this : send: aPacket "Send aPacket, leaving the responsibility of routing to the node." self linksTowards: aPacket destinationAddress do: [ :link | self send: aPacket via: link ] so for linkTwowards the anAddress is the `aPacket destinationAdress ` and the aBlock is ` [:link | self send: aPacket via: link ` so if the address is the loopback one it would be ` self send: aPacket via: loopback ` and send is this : send: aPacket via: aLink aLink emit: aPacket so that would be ` loopback emit : aPackage ` and that would lead to : emit: aPacket "Packets are not transmitted right away, but stored. Transmission is explicitly triggered later, by sending #transmit:." packetsToTransmit add: aPacket where packetsToTransmit is a OrderedCollection where the packet is added Waiting till the transmit method is called where the sending of a package is simulated. Roelof --- End Message ---
Re: [Pharo-users] running Pharo8 in Digitalocean
Have you considered installing Ubuntu App from Microsoft App Store? cheers -ben On Sun, 19 Apr 2020 at 01:15, Sanjay Minni wrote: > Hi, > > I am using a Windows 10 local machine and digitalocean ubuntu server > droplet > - how can I run pharo 8 remotedly in the windows 10 inbuilt powershell ssh > terminal - or any other method > > (I have successfully executed > # ./pharo Pharo.image eval --no-quit 'ZnServer startDefaultOn: 8080' > and connected from my local machine) >
[Pharo-users] mentor question 2.
--- Begin Message --- Hello, I have to make some code that convert a binary to a decimal and im not allowed to use the convert methods that Pharo has. So I have written this : decimalFromBinary: aString | result isValid | isValid = self isValidBinary: aString. isValid ifTrue: [ result := 0. aString reverse withIndexDo: [ :digit :index | result := result + (digit digitValue * (2 raisedTo: index - 1)) ]. ^ result ] ifFalse: [ ^ nil ] isValidBinary: aString ^ aString allSatisfy: [ :c | c = 0 or: [ c = 1 ] ] but on the first method I see a message that the temp variables are read before written. and the second one I see a message that I use a or instead of searching literals. Where did I think wrong here ? Roelof --- End Message ---
Re: [Pharo-users] mentor question 2.
In the first method you aren't doing an assignment, are sending the message = to the temp isValid, if you change the method to: decimalFromBinary: aString | result isValid | * isValid := self isValidBinary: aString.* isValid ifTrue: [ result := 0. aString reverse withIndexDo: [ :digit :index | result := result + (digit digitValue * (2 raisedTo: index - 1)) ]. ^ result ] ifFalse: [ ^ nil ] it should work. In the second one you're comparing characters with numbers, this will always return false because the number 0 is not the same as the character 0. Use isValidBinary: aString ^ aString allSatisfy: [ :c | c = $0 or: [ c = $1 ] ] or something like isValidBinary: aString ^ aString allSatisfy: [ :c | '01' includes: c ] On Sun, Apr 26, 2020 at 2:52 PM Roelof Wobben via Pharo-users < pharo-users@lists.pharo.org> wrote: > Hello, > > I have to make some code that convert a binary to a decimal and im not > allowed to use the convert methods that Pharo has. > > So I have written this : > > > decimalFromBinary: aString > | result isValid | > isValid = self isValidBinary: aString. > isValid > ifTrue: [ result := 0. > aString reverse > withIndexDo: > [ :digit :index | result := result + (digit > digitValue * (2 raisedTo: index - 1)) ]. > ^ result ] > ifFalse: [ ^ nil ] > > isValidBinary: aString > ^ aString allSatisfy: [ :c | c = 0 or: [ c = 1 ] ] > > > but on the first method I see a message that the temp variables are read > before written. > and the second one I see a message that I use a or instead of searching > literals. > > Where did I think wrong here ? > > Roelof > > >
Re: [Pharo-users] mentor question 2.
> On 26 Apr 2020, at 20:10, Gabriel Cotelli wrote: > > In the first method you aren't doing an assignment, are sending the message = > to the temp isValid, if you change the method to: > decimalFromBinary: aString > | result isValid | > isValid := self isValidBinary: aString. > isValid > ifTrue: [ result := 0. > aString reverse > withIndexDo: > [ :digit :index | result := result + (digit > digitValue * (2 raisedTo: index - 1)) ]. > ^ result ] > ifFalse: [ ^ nil ] > it should work. There is a #reverseWithIndexDo: method Also, #digitValue might be considered a builtin method that you are not allowed to use. Since you already did the #isValidBinary: test, you could say (digit charCode - $0 charCode) > In the second one you're comparing characters with numbers, this will always > return false because the number 0 is not the same as the character 0. > Use > isValidBinary: aString > ^ aString allSatisfy: [ :c | c = $0 or: [ c = $1 ] ] > or something like > > isValidBinary: aString > ^ aString allSatisfy: [ :c | '01' includes: c ] > > On Sun, Apr 26, 2020 at 2:52 PM Roelof Wobben via Pharo-users > wrote: > Hello, > > I have to make some code that convert a binary to a decimal and im not > allowed to use the convert methods that Pharo has. > > So I have written this : > > > decimalFromBinary: aString > | result isValid | > isValid = self isValidBinary: aString. > isValid > ifTrue: [ result := 0. > aString reverse > withIndexDo: > [ :digit :index | result := result + (digit > digitValue * (2 raisedTo: index - 1)) ]. > ^ result ] > ifFalse: [ ^ nil ] > > isValidBinary: aString > ^ aString allSatisfy: [ :c | c = 0 or: [ c = 1 ] ] > > > but on the first method I see a message that the temp variables are read > before written. > and the second one I see a message that I use a or instead of searching > literals. > > Where did I think wrong here ? > > Roelof > >
Re: [Pharo-users] mentor question 2.
--- Begin Message --- Op 26-4-2020 om 20:17 schreef Sven Van Caekenberghe: On 26 Apr 2020, at 20:10, Gabriel Cotelli wrote: In the first method you aren't doing an assignment, are sending the message = to the temp isValid, if you change the method to: decimalFromBinary: aString | result isValid | isValid := self isValidBinary: aString. isValid ifTrue: [ result := 0. aString reverse withIndexDo: [ :digit :index | result := result + (digit digitValue * (2 raisedTo: index - 1)) ]. ^ result ] ifFalse: [ ^ nil ] it should work. There is a #reverseWithIndexDo: method Also, #digitValue might be considered a builtin method that you are not allowed to use. Since you already did the #isValidBinary: test, you could say (digit charCode - $0 charCode) In the second one you're comparing characters with numbers, this will always return false because the number 0 is not the same as the character 0. Use isValidBinary: aString ^ aString allSatisfy: [ :c | c = $0 or: [ c = $1 ] ] or something like isValidBinary: aString ^ aString allSatisfy: [ :c | '01' includes: c ] On Sun, Apr 26, 2020 at 2:52 PM Roelof Wobben via Pharo-users wrote: Hello, I have to make some code that convert a binary to a decimal and im not allowed to use the convert methods that Pharo has. So I have written this : decimalFromBinary: aString | result isValid | isValid = self isValidBinary: aString. isValid ifTrue: [ result := 0. aString reverse withIndexDo: [ :digit :index | result := result + (digit digitValue * (2 raisedTo: index - 1)) ]. ^ result ] ifFalse: [ ^ nil ] isValidBinary: aString ^ aString allSatisfy: [ :c | c = 0 or: [ c = 1 ] ] but on the first method I see a message that the temp variables are read before written. and the second one I see a message that I use a or instead of searching literals. Where did I think wrong here ? Roelof Thanks, this problem is solved. Roelof --- End Message ---
