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Re: [Pharo-users] How to calculate someone's age elegantly? Does Duration work?

by Tim Mackinnon

Yes that's a good solution, however I'm really surprised that with the plethora of dates, durations, timespans (we are well served with a very rich time and date domain) that this isn't already in the image? It seems very surprising. In fact the group I was working with (other language programmers) kept looking and looking for something as they felt certain they had overlooked it given all those promising classes. I'm curious why it's not in there? And would we also expect to find its equivalent on a timespan (maybe delegating back to this date method? This assumes that timespan can be fixed as it loses precision unexpectedly). Thanks for the reply. Tim Sent from my iPhone > On 21 Jul 2017, at 06:41, K K Subbu <kksubbu.ml(a)gmail.com> wrote: > > Date>>ageOn: aDate > " assert: (self <= aDate) > | age | > > age = aDate year - self year + 1. > aDate monthIndex < self monthIndex ifTrue: [ ^age - 1 ]. > (aDate monthIndex = self monthIndex and: [aDate dayOfMonth < self dayOfMonth]) ifTrue: [ ^age - 1 ]. > ^age > > HTH .. Subbu > >> On Friday 21 July 2017 05:28 AM, Tim Mackinnon wrote: >> Hi - I just ran a great MobProgramming session with Smalltalk for the XProLo group - and there was lots of great feedback and questions, however one of them really got me thinkingâ¦ >> We did a little exercise to create a Person class with name, dob - and then we TDDâd an age methodâ¦ which seems simple on the surface but it gets to an interesting point - what about leap years? How old is someone on those years? >> I thought that our plethora of Date/Duration classes might handle this - but I couldnât spot something obvious and was wondering if someone had a neat answer. >> Essentially if you try: >> age >> ^Date today - self dob >> You get a Duration, >> But there isnât : >> ^(Date today - self dob) asYears >> There is is asDay >> ^(Date today - self dob) asDays >> But then can you really >> ^(Date today - self dob) asDays / 365) truncated >> But what about leap yearsâ¦ so >> ^(Date today - self dob) asDays / 365.25) truncated >> It all feels a bit inelegant and I suspect there is a better Smalltalk way that is eluding me? Any suggestions? >> Tim > >

July 21, 2017

Re: [Pharo-users] How to calculate someone's age elegantly? Does Duration work?

by K K Subbu

Date>>ageOn: aDate " assert: (self <= aDate) | age | age = aDate year - self year + 1. aDate monthIndex < self monthIndex ifTrue: [ ^age - 1 ]. (aDate monthIndex = self monthIndex and: [aDate dayOfMonth < self dayOfMonth]) ifTrue: [ ^age - 1 ]. ^age HTH .. Subbu On Friday 21 July 2017 05:28 AM, Tim Mackinnon wrote: > Hi - I just ran a great MobProgramming session with Smalltalk for the XProLo group - and there was lots of great feedback and questions, however one of them really got me thinkingâ¦ > > We did a little exercise to create a Person class with name, dob - and then we TDDâd an age methodâ¦ which seems simple on the surface but it gets to an interesting point - what about leap years? How old is someone on those years? > > I thought that our plethora of Date/Duration classes might handle this - but I couldnât spot something obvious and was wondering if someone had a neat answer. > > Essentially if you try: > > age > > ^Date today - self dob > > You get a Duration, > > But there isnât : > > ^(Date today - self dob) asYears > > There is is asDay > > ^(Date today - self dob) asDays > > But then can you really > > ^(Date today - self dob) asDays / 365) truncated > > But what about leap yearsâ¦ so > > ^(Date today - self dob) asDays / 365.25) truncated > > > It all feels a bit inelegant and I suspect there is a better Smalltalk way that is eluding me? Any suggestions? > > Tim >

July 21, 2017

Re: [Pharo-users] How to calculate someone's age elegantly? Does Duration work?

by Tim Mackinnon

Hmmm to compound my woes ) I notice that Timespan is broken - as the following fails: testEndDateIsPreserved | startDate endDate | startDate := Date year: 2000 month: 2 day: 28. endDate := Date year: 2011 month: 2 day: 27. self assert: (Timespan starting: startDate ending: endDate) end equals: endDate. > On 21 Jul 2017, at 00:58, Tim Mackinnon <tim(a)testit.works> wrote: > > Hi - I just ran a great MobProgramming session with Smalltalk for the XProLo group - and there was lots of great feedback and questions, however one of them really got me thinkingâ¦ > > We did a little exercise to create a Person class with name, dob - and then we TDDâd an age methodâ¦ which seems simple on the surface but it gets to an interesting point - what about leap years? How old is someone on those years? > > I thought that our plethora of Date/Duration classes might handle this - but I couldnât spot something obvious and was wondering if someone had a neat answer. > > Essentially if you try: > > age > > ^Date today - self dob > > You get a Duration, > > But there isnât : > > ^(Date today - self dob) asYears > > There is is asDay > > ^(Date today - self dob) asDays > > But then can you really > > ^(Date today - self dob) asDays / 365) truncated > > But what about leap yearsâ¦ so > > ^(Date today - self dob) asDays / 365.25) truncated > > > It all feels a bit inelegant and I suspect there is a better Smalltalk way that is eluding me? Any suggestions? > > Tim

July 21, 2017

How to calculate someone's age elegantly? Does Duration work?

by Tim Mackinnon

Hi - I just ran a great MobProgramming session with Smalltalk for the XProLo group - and there was lots of great feedback and questions, however one of them really got me thinkingâ¦ We did a little exercise to create a Person class with name, dob - and then we TDDâd an age methodâ¦ which seems simple on the surface but it gets to an interesting point - what about leap years? How old is someone on those years? I thought that our plethora of Date/Duration classes might handle this - but I couldnât spot something obvious and was wondering if someone had a neat answer. Essentially if you try: age ^Date today - self dob You get a Duration, But there isnât : ^(Date today - self dob) asYears There is is asDay ^(Date today - self dob) asDays But then can you really ^(Date today - self dob) asDays / 365) truncated But what about leap yearsâ¦ so ^(Date today - self dob) asDays / 365.25) truncated It all feels a bit inelegant and I suspect there is a better Smalltalk way that is eluding me? Any suggestions? Tim

July 20, 2017

Re: [Pharo-users] Zinc newbie question: How to get file metadata from Dropbox

by jb

Sven Van Caekenberghe-2 wrote >> On 20 Jul 2017, at 19:57, Johannes Brauer < > brauer@ > > wrote: >> >> Hi! >> >> To download a file from Dropbox is easy: >> >> ZnClient new >> https; host: 'content.dropboxapi.com'; >> addPath: '2'; addPath: 'files'; addPath: 'download'; >> headerAt: 'Authorization' put: >> 'Bearer > <my generated access token> > '; >> headerAt: 'Dropbox-API-Arg' put: '{"path": "/demo.txt"}' ;get. >> >> But I cannot figure out how to get file metadata >> (https://www.dropbox.com/developers/documentation/http/documentation#files-g…) >> >> If I try the following >> >> (ZnClient new >> https; host: 'api.dropboxapi.com'; >> addPath: '2'; addPath: 'files'; addPath: 'get_metadata'; >> headerAt: 'Authorization' put: >> 'Bearer >> QfCCKhxI-HwAAAAAAAAGdeT916yqY4tkX3EN6EW2S3EMxYyv5Xky9LeCxuGi8_o7'; >> headerAt: 'Content-Type' put: 'application/json'; >> formAt: 'path' put: 'demo.txt'; post). >> >> I get the error message from Dropbox: >> >> Error in call to API function "files/get_metadata": Bad HTTP >> "Content-Type" header: "application/x-www-form-urlencoded". Expecting >> one of "application/json", "application/json; charset=utf-8", >> "text/plain; charset=dropbox-cors-hack". > > By using #formAt:put: you implicitly create a > ZnApplicationFormUrlEncodedEntity instance, this is not what you > want/need. This would POST proper JSON: > > ZnClient new > https; host: 'api.dropboxapi.com'; > addPath: '2'; addPath: 'files'; addPath: 'get_metadata'; > headerAt: 'Authorization' put: 'Bearer > QfCCKhxI-HwAAAAAAAAGdeT916yqY4tkX3EN6EW2S3EMxYyv5Xky9LeCxuGi8_o7'; > entity: (ZnEntity with: (STONJSON toString: { #path->'demo.txt' } > asDictionary) type: ZnMimeType applicationJson); > post. > > Does that work ? yes, it does thanks a lot -- View this message in context: http://forum.world.st/Zinc-newbie-question-How-to-get-file-metadata-from-Dr… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

July 20, 2017

Re: [Pharo-users] Zinc newbie question: How to get file metadata from Dropbox

by Sven Van Caekenberghe

> On 20 Jul 2017, at 19:57, Johannes Brauer <brauer(a)nordakademie.de> wrote: > > Hi! > > To download a file from Dropbox is easy: > > ZnClient new > https; host: 'content.dropboxapi.com'; > addPath: '2'; addPath: 'files'; addPath: 'download'; > headerAt: 'Authorization' put: > 'Bearer <my generated access token>'; > headerAt: 'Dropbox-API-Arg' put: '{"path": "/demo.txt"}' ;get. > > But I cannot figure out how to get file metadata > (https://www.dropbox.com/developers/documentation/http/documentation#files-g…) > > If I try the following > > (ZnClient new > https; host: 'api.dropboxapi.com'; > addPath: '2'; addPath: 'files'; addPath: 'get_metadata'; > headerAt: 'Authorization' put: > 'Bearer QfCCKhxI-HwAAAAAAAAGdeT916yqY4tkX3EN6EW2S3EMxYyv5Xky9LeCxuGi8_o7'; > headerAt: 'Content-Type' put: 'application/json'; > formAt: 'path' put: 'demo.txt'; post). > > I get the error message from Dropbox: > > Error in call to API function "files/get_metadata": Bad HTTP "Content-Type" header: "application/x-www-form-urlencoded". Expecting one of "application/json", "application/json; charset=utf-8", "text/plain; charset=dropbox-cors-hack". By using #formAt:put: you implicitly create a ZnApplicationFormUrlEncodedEntity instance, this is not what you want/need. This would POST proper JSON: ZnClient new https; host: 'api.dropboxapi.com'; addPath: '2'; addPath: 'files'; addPath: 'get_metadata'; headerAt: 'Authorization' put: 'Bearer QfCCKhxI-HwAAAAAAAAGdeT916yqY4tkX3EN6EW2S3EMxYyv5Xky9LeCxuGi8_o7'; entity: (ZnEntity with: (STONJSON toString: { #path->'demo.txt' } asDictionary) type: ZnMimeType applicationJson); post. Does that work ? > Probably I am using ZnClient wrongly. > > Johannes

July 20, 2017

Zinc newbie question: How to get file metadata from Dropbox

by Johannes Brauer

Hi! To download a file from Dropbox is easy: ZnClient new https; host: 'content.dropboxapi.com'; addPath: '2'; addPath: 'files'; addPath: 'download'; headerAt: 'Authorization' put: 'Bearer <my generated access token>'; headerAt: 'Dropbox-API-Arg' put: '{"path": "/demo.txt"}' ;get. But I cannot figure out how to get file metadata (https://www.dropbox.com/developers/documentation/http/documentation#files-g…) If I try the following (ZnClient new https; host: 'api.dropboxapi.com'; addPath: '2'; addPath: 'files'; addPath: 'get_metadata'; headerAt: 'Authorization' put: 'Bearer QfCCKhxI-HwAAAAAAAAGdeT916yqY4tkX3EN6EW2S3EMxYyv5Xky9LeCxuGi8_o7'; headerAt: 'Content-Type' put: 'application/json'; formAt: 'path' put: 'demo.txt'; post). I get the error message from Dropbox: Error in call to API function "files/get_metadata": Bad HTTP "Content-Type" header: "application/x-www-form-urlencoded". Expecting one of "application/json", "application/json; charset=utf-8", "text/plain; charset=dropbox-cors-hack". Probably I am using ZnClient wrongly. Johannes

July 20, 2017

UK Smalltalk User Group Meeting - Monday, 31st July

by Giovanni Corriga

The next meeting of the UK Smalltalk User Group Meeting will be on Monday, 31st July. We'll meet at a new venue The City Pride ( http://www.cityprideclerkenwell.co.uk/ ) at 7pm. If you'd like to join us, you can just show up at the pub. You can also sign up in advance at the meeting's Meetup page: https://www.meetup.com/UKSTUG/events/241876612/ . See you there!

July 20, 2017

Re: [Pharo-users] object serialization, STON & PharoJS

by Sven Van Caekenberghe

> On 20 Jul 2017, at 12:08, Diego Lont <diego.lont(a)delware.nl> wrote: > > Hi, > > What I remember of STON is that it simply puts out the entire tree. So it might include things you donât want (like thisContext), and also does not handle loops well. But that is from memory, I might be wrong there. Hmm, I think you are misinformed. STON was specifically designed to handle cycles and structure sharing in object graphs. STON won't interact with thisContext unless you make that part of your domain objects. A limitation of STON is that it won't handle blocks (though in some cases there are workarounds). It is possible to tune how your objects are serialised by STON with various mechanisms, including skipping certain instance variables. > For serialisation you could also look into the Magritte serialisation. It has several extenstions, among them one to output them in the JSon format. Disadvantage is that you have to describe your objects, but this is also helps you only send into the world the things you want. > > Regards, > Diego > >> On 16 Jul 2017, at 21:00, Siemen Baader <siemenbaader(a)gmail.com> wrote: >> >> Hi all, >> >> Iâm trying to transpile the STON class to JavaScript with PharoJS to use it in a client side web application. The goal is it to retrieve object(graphs) from the server and deserialize them in the frontend via xhr. >> >> But PharoJS doesn't support thisContext, I think that's a limitation of the JavaScript VM. PharoJS raises "PjJavascriptTranspilationError - thisContext not supported. Found in Collection >> #toBraceStack:". I tried to add the <pharoJsSkip> pragma to the method in the hope that it will not be needed for my uses, but no luck. >> >> Is the use of thisContext needed in STON, can I avoid it? I had hoped to use STON because it is simple and well documented and unlike JSON handles object graphs and classes. >> >> What are my options? >> >> Alternatively, what else could I use to serialize objects? I'm already using Voyage & Mongo on the backend which deal with JSON internally, and I think Moose also has a serialization component. Using a JS library in the frontend is also an option if there is a Pharo implementation for its format as well. >> >> Thanks, >> Siemen > >

July 20, 2017

Re: [Pharo-users] object serialization, STON & PharoJS

by Sven Van Caekenberghe

> On 16 Jul 2017, at 21:00, Siemen Baader <siemenbaader(a)gmail.com> wrote: > > Hi all, > > Iâm trying to transpile the STON class to JavaScript with PharoJS to use it in a client side web application. The goal is it to retrieve object(graphs) from the server and deserialize them in the frontend via xhr. > > But PharoJS doesn't support thisContext, I think that's a limitation of the JavaScript VM. PharoJS raises "PjJavascriptTranspilationError - thisContext not supported. Found in Collection >> #toBraceStack:". I tried to add the <pharoJsSkip> pragma to the method in the hope that it will not be needed for my uses, but no luck. > > Is the use of thisContext needed in STON, can I avoid it? I had hoped to use STON because it is simple and well documented and unlike JSON handles object graphs and classes. > > What are my options? I don't know about PharoJS so I can't comment. The coolest option would be for someone to implement STON in JavaScript directly, it should be doable, but requires good JS skills. > Alternatively, what else could I use to serialize objects? I'm already using Voyage & Mongo on the backend which deal with JSON internally, and I think Moose also has a serialization component. Using a JS library in the frontend is also an option if there is a Pharo implementation for its format as well. > > Thanks, > Siemen

July 20, 2017