November 2018 - Pharo-users

Re: [Pharo-users] what must be instead of the ??

by Gabriel Cotelli

It's bug in the collect: implementation used in String. I've opened https://pharo.fogbugz.com/f/cases/22652/collect-over-Strings-is-broken On Fri, Nov 9, 2018 at 2:17 PM Roelof Wobben <r.wobben(a)home.nl> wrote: > hmm. > > When I try this on P7 > > |input stepChanges floor| > input := '((('. > floor := 0. > stepChanges := input collect: [ :c | > floor := floor + (c = '(' ifTrue: [ 1 ] ifFalse: [ -1 ]). > floor > ]. > > stepChanges detectIndex: [ :each | each = -1 ] ifNone: [ 'invalid input > yo' ]. > > then I see this error message : Improper store to indexable object. > > Roelof > > > Op 9-11-2018 om 17:39 schreef Roelof Wobben: > > stepChanges := input collect: [ :c | > floor := floor + (c = '(' ifTrue: [ 1 ] ifFalse: [ -1 ]). > floor > ]. > > stepChanges detectIndex: [ :each | each = -1 ] ifNone: [ 'invalid input > yo' ]. > > >

Nov. 9, 2018

Re: [Pharo-users] what must be instead of the ??

by Roelof Wobben

Nov. 9, 2018

Re: [Pharo-users] what must be instead of the ??

by Roelof Wobben

Nov. 9, 2018

Re: [Pharo-users] what must be instead of the ??

by Peter Uhnak

On Fri, Nov 9, 2018 at 1:26 PM Roelof Wobben <r.wobben(a)home.nl> wrote: > Thanks all. > > This code seems to do the job > > santaFloorOnBasement > "calculates which step take Santa to the basement" > | index| > index := 1. > [floor ~= -1 ] whileTrue: > [ floor := ((input at: index) = '(' ) > ifTrue: [ floor + 1 ] > ifFalse: [ floor - 1 ]. > index := index + 1 ]. > > ^ index -1 > You can also think of it from the perspective of data processing and not instruction coding (and mangling of indexes). stepChanges := input collect: [ :c | floor := floor + (c = '(' ifTrue: [ 1 ] ifFalse: [ -1 ]). floor ]. stepChanges detectIndex: [ :each | each = -1 ] ifNone: [ 'invalid input yo' ]. Peter

Nov. 9, 2018

Re: [Pharo-users] what must be instead of the ??

by Roelof Wobben

Nov. 9, 2018

Re: [Pharo-users] what must be instead of the ??

by Ben Coman

On Fri, 9 Nov 2018 at 15:25, Roelof Wobben <r.wobben(a)home.nl> wrote: > Hello, > > I try to solve a adventofcode challenge where I must find out when santa > is first at the basement. the floor is there -1. > So I thought I use a while loop like this : > > santaFloorOnBasement > "calculates which step take Santa to the basement" > | index| > index := 1. > ??? when: (floor >=0 ) do: > [ floor := (input at: index = '(' ) > ifTrue: [ floor + 1 ] > ifFalse: [ floor - 1 ]. > index := index + 1 ]. > > but I cannot find out what must be instead of the ?? > I've never used #when:do: so I can't comment on that. I'd be using #whileTrue: which looks like this... [ condition block ] whileTrue: [ action block ] <<< ??? when: (floor >=0 ) do: >>> [floor>=0] whileTrue: For further examples review the "senders" of #whileTrue: i.e. highlight then press <CTRL-N> on MS Windows > index is the index of the string which has to start with a 1. > floor and input are both instance variables. floor contains the current > floor and input the input of the challenge. > > Can someone help me figure this out so the next time I can do this on my > own. > btw you have a problem here... floor := (input at: index = '(' ) Its not doing what you think and you'll get "Error: only integers should be used as indices" Consider you that two messages are being sent: * the keyword message... #at: * the binary message.... #= Homework :)... what is the third type of message and the evaluation priority of all three. Homework 2... Review the "implementors" of message #= <CTRL-M> on MS Windows cheers -ben P.S. As it current stands, you'll get a "SubscriptOutOfBounds" error if the input ends before Santa gets to the basement. An exercise, fix that using the existing loop. Then consider using an iterator... input do: [ :bracket | (bracket = $( ) ifTrue: [ floor := floor + 1 ] . (bracket = $( ) ifTrue: [ floor := floor + 1 ] ]. and maybe something else for you to experiment with... movement := Dictionary new. movement at: $( put: 1. movement at: $) put: -1. input do: [ :char | floor := floor + (movement at: char ifAbsent: [0]) ]. cheers -ben

Nov. 9, 2018

Re: [Pharo-users] what must be instead of the ??

by Tim Mackinnon

To add to what Joachim has said, and to help you help yourself, look at what methods are implemented in BlockClosure and Boolean and see how things work (the code is there for you to understand it quite easily - there is little magic going on). You can find all kinds of interesting and helpful things and can even implement your own if you ever want to. Tim Sent from my iPhone > On 9 Nov 2018, at 16:02, Joachim Tuchel <jtuchel(a)objektfabrik.de> wrote: > > So I guess that floor > 0 is your condition, right? In Smalltalk, the idea is that you evaluate the condition and ask the result of it (usually true or false) to do something. > > Right so far? That would mean the receiver of your wanted message is either the result of the evaluation or or a Block which will be evaluated in a construct like ifTrue: or something like whileTrue: > > HTH > > Joachim > > > >> Am 09.11.2018 um 08:24 schrieb Roelof Wobben <r.wobben(a)home.nl>: >> >> Hello, >> >> I try to solve a adventofcode challenge where I must find out when santa is first at the basement. the floor is there -1. >> So I thought I use a while loop like this : >> >> santaFloorOnBasement >> "calculates which step take Santa to the basement" >> | index| >> index := 1. >> ??? when: (floor >=0 ) do: >> [ floor := (input at: index = '(' ) >> ifTrue: [ floor + 1 ] >> ifFalse: [ floor - 1 ]. >> index := index + 1 ]. >> >> but I cannot find out what must be instead of the ?? >> >> index is the index of the string which has to start with a 1. >> floor and input are both instance variables. floor contains the current floor and input the input of the challenge. >> >> Can someone help me figure this out so the next time I can do this on my own. >> >> Roelof >> >> >> > >

Nov. 9, 2018

Re: [Pharo-users] what must be instead of the ??

by Joachim Tuchel

So I guess that floor > 0 is your condition, right? In Smalltalk, the idea is that you evaluate the condition and ask the result of it (usually true or false) to do something. Right so far? That would mean the receiver of your wanted message is either the result of the evaluation or or a Block which will be evaluated in a construct like ifTrue: or something like whileTrue: HTH Joachim > Am 09.11.2018 um 08:24 schrieb Roelof Wobben <r.wobben(a)home.nl>: > > Hello, > > I try to solve a adventofcode challenge where I must find out when santa is first at the basement. the floor is there -1. > So I thought I use a while loop like this : > > santaFloorOnBasement > "calculates which step take Santa to the basement" > | index| > index := 1. > ??? when: (floor >=0 ) do: > [ floor := (input at: index = '(' ) > ifTrue: [ floor + 1 ] > ifFalse: [ floor - 1 ]. > index := index + 1 ]. > > but I cannot find out what must be instead of the ?? > > index is the index of the string which has to start with a 1. > floor and input are both instance variables. floor contains the current floor and input the input of the challenge. > > Can someone help me figure this out so the next time I can do this on my own. > > Roelof > > >

Nov. 9, 2018

what must be instead of the ??

by Roelof Wobben

Hello, I try to solve a adventofcode challenge where I must find out when santa is first at the basement. the floor is there -1. So I thought I use a while loop like this : santaFloorOnBasement Â Â Â "calculates which step take Santa to the basement" Â Â Â Â | index| Â Â Â Â index := 1. Â Â Â Â ??? when: (floor >=0 ) do: Â Â Â Â Â Â Â [ floor := (input at: index = '(' ) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ifTrue: [ floor + 1 ] Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ifFalse: [ floor - 1 ]. Â Â Â Â Â Â Â Â index := index + 1 ]. but I cannot find out what must be instead of the ?? index is the index of the string which has to start with a 1. floorÂ and input are both instance variables. floor contains the current floor and input the input of the challenge. Can someone help me figure this out so the next time I can do this on my own. Roelof

Nov. 9, 2018

Re: [Pharo-users] using latest iceberg with Pharo 6.1 / 7.0

by Sanjay Minni

Thanks Sven, Guille, I am only looking at iceberg for development / loading of a software project being developed in Pharo (i.e. not develop iceberg itself ... if the question was on iceberg development maybe I would have posted in Pharo-developers group ;) ). so it seems there is nothing to be done to "use" iceberg. I have some questions ... pardon if they are naive but I am pretty green in the pharo environment. Question 1: This is on the sequence for cloning a repository and loading the project from bitbucket with a Metacello configuration defined. - I have cloned on pharo 6.1... after that do I have to load the project / packages as a separate step ? after cloning, iceberg shows as follows Name CurrBranch loaded version Status myProject development No Package Loaded not loaded Question 2: what are the steps to pull the latest version of the project and overwrite the existing package versions already loaded Question 3: Are class side initialize scripts triggerred on first time load and on reload Question 4: the project has several external files .jpegs, .css .json etc, ... are they also pulled / pushed alongwith pharo code thru iceberg Question 5: how do I update iceberg 1.4.0 in pharo 6.1 image / 7.0 image Question 6: is there documentation / guide available for iceberg like the monticello / metacello guide in Deep Into Pharo thanks Sanjay Guillermo Polito wrote > On Fri, Nov 2, 2018 at 6:25 PM Sanjay Minni < > sm@ > > wrote: > >> If I want to use iceberg then should I first update pharo image as >> mentioned >> on github iceberg homepage (https://github.com/pharo-vcs/iceberg) >> > > I'd also insist here with Sven. Could you please explain better what are > you trying to accomplish? > > >> for 6.1: should I run the script as given on the homepage or is there an >> easier way to upgrade (i.e. some UI - point and click) ? >> > > This is ok, and this will update latest release (not latest dev version). > Usually from a user perspective yor may want only latest release and > that's > ok. > > >> >> for 7.0: its mentioned to clone iceberg and pull changes >> - i run iceberg ... >> - dialog opens:repositories - there is a line "iceberg ... local >> repositories missing". >> how should i proceed from here ? >> > [SNIP] > > Actually, here what you were doing is loading latest version of iceberg to > contribute to it. > If you want to use Iceberg, you need to do nothing :) The latest iceberg > version is already in Pharo7 and you had nothing to do. > > Cheers, > Guille ----- --- Regards, Sanjay -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Nov. 8, 2018