2015 Pharo Prague Lambda Meetup
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This document provides an overview of Pharo, an open-source Smalltalk-based programming language and environment: - Pharo is a pure object-oriented language where everything is an object, including classes. It has a simple syntax that fits on a postcard and a complete but elegant object model. - Pharo has a large community of developers and is used for a wide range of projects including web frameworks, databases, tools, and games. It has an active developer community on sites like Twitter and YouTube. - The document outlines some of Pharo's key features like its live, interactive development environment; single inheritance; public methods and protected attributes; and use of messages, blocks, and keywords for
![The complete syntax
exampleWithNumber: x
“A method that illustrates every part of Smalltalk method syntax”
<menu>
| y |
true & false not & (nil isNil) ifFalse: [self halt].
y := self size + super size.
#($a #a ‘a’ 1 1.0)
do: [ :each | Transcript
show: (each class name);
show: (each printString);
show: ‘ ‘].
^ x < y](https://image.slidesharecdn.com/2015-pharo-praguelambda-150226015106-conversion-gate01/85/2015-Pharo-Prague-Lambda-Meetup-50-320.jpg)
![The complete syntax
exampleWithNumber: x
“A method that illustrates every part of Smalltalk method syntax”
<menu>
| y |
true & false not & (nil isNil) ifFalse: [self halt].
y := self size + super size.
#($a #a ‘a’ 1 1.0)
do: [ :each | Transcript
show: (each class name);
show: (each printString);
show: ‘ ‘].
^ x < y](https://image.slidesharecdn.com/2015-pharo-praguelambda-150226015106-conversion-gate01/85/2015-Pharo-Prague-Lambda-Meetup-52-320.jpg)
![Blocks: Closures all the way
• Anonymous method
• Passed as method argument or stored
• Functions
fct(x)= x*x+3, fct(2).
!
fct :=[:x| x * x + 3].
fct value: 2
!](https://image.slidesharecdn.com/2015-pharo-praguelambda-150226015106-conversion-gate01/85/2015-Pharo-Prague-Lambda-Meetup-77-320.jpg)
![Every control structure is a message
4 timesRepeat: [Beeper beep]
max: aNumber!
! ^ self < aNumber !
! ! ifTrue: [aNumber] !
! ! ifFalse: [self]](https://image.slidesharecdn.com/2015-pharo-praguelambda-150226015106-conversion-gate01/85/2015-Pharo-Prague-Lambda-Meetup-78-320.jpg)
![<= aPoint !
! "Answer whether the receiver is neither!
! below nor to the right of aPoint."!
!
! ^ x <= aPoint x and: [y <= aPoint y]
Method name Argument Comment
Return Binary message
Keyword messageInstance variable
Block
(2@3) <= (5@6) true](https://image.slidesharecdn.com/2015-pharo-praguelambda-150226015106-conversion-gate01/85/2015-Pharo-Prague-Lambda-Meetup-79-320.jpg)
2015 Pharo Prague Lambda Meetup
- 1. Pharo: Live objects for complex projects http://stephane.ducasse.free.fr http://www.pharo.org
- 3. I did my PhD in Lisp and Scheme :)
- 5. Talk Roadmap • Pharo: an open-source project • Get the feel • Model/Syntax • Coding with the audience • Web Development in Pharo • Ongoing works • Wrap-up
- 6. http://www.pharo.org Pure object language Great community of active doers Powerful and full access Elegant and fun to program Living system under your fingers 100% MIT inside Mac, Linuxes, Windows, iOS
- 7. A powerful engine to invent (y)our future
- 8. Some projects Web frameworks - Seaside, iliad, HTTP2, Tide, Aida, Mustache, Oauth, WebSocket CSS styling Format parsers - XML, HTML, NeoJSON, NeoCSV. Application Security, Graphics frameworks - Roassal, Mondrian, EyeSee, GraphET, Tool builders - Glamour, Spec, XUL, MacNative, Databases - DBXTalk, Mongo, Riak, CouchDB, MySql, PunQLite. Object-Oriented databases - Magma, Goods. Database abstraction - Voyage, ROE MetaCompiler - Petit Parser, SmaCC - Proxy, Logging - SystemLogger, Toothpick, SimpleLogger Units: Aconcagua, Units Time - Chronos Calendars, Timezones Productivity Tools - Codecritics, Refactorings, Cherry picking merge tools: merge tool, Komitter Versionner, Mock frameworks (baby mock), PDFgeneration - Artefact, Testing frameworks - PhExample, SUnit Assembly generation: ASMJIT, Integration Tools: Hudson, Alternate window manager, Games: Tetris, Sokoban, Miner, Chess, CrossWords MetaModeling Frameworks - Magritte, Platypus, Cloud deployement - cloudfork cloudPharo, 3D: Roassal3d, NBOpenGL, JVM connection Bio informatics, ODE solvers, Interactive Geometry - DrGeo…
- 9. Some projects Web frameworks - Seaside, iliad, HTTP2, Tide, Aida, Mustache, Oauth, WebSocket CSS styling Format parsers - XML, HTML, NeoJSON, NeoCSV. Application Security, Graphics frameworks - Roassal, Mondrian, EyeSee, GraphET, Tool builders - Glamour, Spec, XUL, MacNative, Databases - DBXTalk, Mongo, Riak, CouchDB, MySql, PunQLite. Object-Oriented databases - Magma, Goods. Database abstraction - Voyage, ROE MetaCompiler - Petit Parser, SmaCC - Proxy, Logging - SystemLogger, Toothpick, SimpleLogger Units: Aconcagua, Units Time - Chronos Calendars, Timezones Productivity Tools - Codecritics, Refactorings, Cherry picking merge tools: merge tool, Komitter Versionner, Mock frameworks (baby mock), PDFgeneration - Artefact, Testing frameworks - PhExample, SUnit Assembly generation: ASMJIT, Integration Tools: Hudson, Alternate window manager, Games: Tetris, Sokoban, Miner, Chess, CrossWords MetaModeling Frameworks - Magritte, Platypus, Cloud deployement - cloudfork cloudPharo, 3D: Roassal3d, NBOpenGL, JVM connection Bio informatics, ODE solvers, Interactive Geometry - DrGeo… AND MUCH MORE
- 10. Our goal...
- 11. An ecosystem where innovation/business bloom
- 12. We want that **you** can make money with Pharo. We want to be able to invent solutions to existing problems. ! We want a powerful innovative dynamic language where we can build our future.
- 13. We are a cool community
- 14. Tweets, blogs, buzz Pharo 3,303 tweets / 1092 followers S. Ducasse tweets 669 / 804 followers S. Stinckwich 8712 / 1006 followers Moose 502 tweets / 255 followers Youtube Pharo smalltalk: about 1540 videos!
- 15. • Uni. of Buenos Aires • Uni. of Bern • Uni. of Maroua • Uni. of Brussels • Ecole des Mines de Douai • Uni. de Savoie • Ivan Franko Nat. Uni. of Lviv • Czech Technical Uni. • CULS Prague • Uni. of Quilmes • Uni. of La Plata • Northern Michigan Uni. • Uni. Technologica Nacional (UTN) • Uni. Catholic of Argentina • Uni. of Chile • Uni. Policnica de Catalunya • Uni. de Bretagne Occidentale • Uni. of Tomsk • Uni. of Fernhagen • IT University of Copenhagen • Uni. Cat del Sacro Cuore of Brescia Pharo's Teachers
- 17. Lafhis (AR) Software Composition Group (CH) CAR (FR) RMOD (FR) Ummisco (IRD) Reveal (CH) Lysic (FR) Pleiad (CL) CEA-List (FR) Uqbar (AR) CCMI-FIT(CZ) Research Groups
- 19. Books Pharo by example http://www.pharobyexample.org translated to french, merci! translated to spanish, gracias! translated to japanese, ありがとう! Deep into Pharo http://www.deepintopharo.org Numerical Methods https://github.com/SquareBracketAssociates/NumericalMethods/ releases New books in preparation Updated Pharo by Example Entreprise Pharo Fun with Pharo
- 23. Continuous API Testing keep your services under control 24/7 Norbert Hartl norbert@2denker.de www.2denker.de
- 24. eMCee is developed and deployed using pharo - zinc - seaside - jquery - magritte - mongotalk - magritte-mongo - fuel - metacello mail@2denker.de
- 26. • Entry Level Track & Trace Product • Complements T3 Full Product • One Page Javascript HTML5 / Ajax Client • REST Back End in Pharo Smalltalk • Gateways to multiple data providers
- 27. WEBDRUCK.CH Web-To-Print Solution • Design and create individual printed matter • eShop with credit card payment • High quality PDF output with Printing Process integration • Thousands of orders for seven Swiss printing companies
- 29. iBizLog - http://www.ibizlog.com A product by Smallworks Tuesday, May 15, 12
- 39. Pinesoft MBagger
- 40. Since may 2008 Pharo 4.0 - Apr/Jul 2015 (1271 issues closed…) Pharo 3.0 - Apr 2013 (2364 issues closed) Pharo 2.0 - Apr 2013 (1727 issues closed) Pharo 1.4 - Apr 2012 (860 updates) Pharo 1.3 (700 updates) Pharo 1.2 - mar 2011 (500 updates) Pharo 1.1 - jul 2010 (410 updates)
- 41. We are improving the complete system!
- 42. Of course not everything is perfect :) But it feels like that:
- 43. Pharo is yours
- 44. with 20 min per week you can get an impact!
- 45. Getting the object feel • Live interaction • Using Inspectors • Talk and interact with objects • Programs are objects too
- 49. Simplicity and elegance • Syntax fits on a postcard! • Simple but complete object model
- 50. The complete syntax exampleWithNumber: x “A method that illustrates every part of Smalltalk method syntax” <menu> | y | true & false not & (nil isNil) ifFalse: [self halt]. y := self size + super size. #($a #a ‘a’ 1 1.0) do: [ :each | Transcript show: (each class name); show: (each printString); show: ‘ ‘]. ^ x < y
- 51. …
- 52. The complete syntax exampleWithNumber: x “A method that illustrates every part of Smalltalk method syntax” <menu> | y | true & false not & (nil isNil) ifFalse: [self halt]. y := self size + super size. #($a #a ‘a’ 1 1.0) do: [ :each | Transcript show: (each class name); show: (each printString); show: ‘ ‘]. ^ x < y
- 53. Less is more! No constructors, no static methods, no operators No type declaration, no primitive types, No interfaces, no need for factory No packages/private/protected modifiers No parametrized types No boxing/unboxing Still powerful
- 54. A Pure OO World Only objects! mouse, booleans, arrays, numbers, strings, windows, scrollbars, canvas, files, trees, compilers, sound, url, socket, fonts, text, collections, stack, shortcut, streams, …
- 55. Objects are instances of Classes
- 56. Objects are instances of Classes ! (10@200)
- 57. Objects are instances of Classes ! (10@200) class
- 58. Objects are instances of Classes ! (10@200) class Point
- 59. Classes are objects too ! !
- 60. Classes are objects too ! Point selectors ! ! !
- 61. Classes are objects too ! Point selectors ! an IdentitySet(#eightNeighbors #+ #isZero #sortsBefore: #degrees #printOn: #sideOf: #fourNeighbors #hash #roundUpTo: #min: #min:max: #max #adaptToCollection:andSend: #quadrantOf: #crossProduct: #= #nearestPointOnLineFrom:to: #bitShiftPoint: #* #guarded #insideTriangle:with:with: #grid: #truncateTo: #y #setR:degrees: #normal #directionToLineFrom:to: #truncated #nearestPointAlongLineFrom:to: #theta #scaleTo: #encodePostscriptOn: #> #asPoint #extent: #r #roundTo: #max: #interpolateTo:at: #triangleArea:with: #angleWith: #dotProduct: #isSelfEvaluating #'<=' #to:intersects:to: #'//' #isInsideCircle:with:with: #< #scaleFrom:to: #corner: #to:sideOf: #x #'>=' #roundDownTo: #onLineFrom:to:within: #transposed #ceiling #angle #basicType #translateBy: #asFloatPoint #'' #adaptToNumber:andSend: #abs #negated #octantOf: #asIntegerPoint #flipBy:centerAt: #scaleBy: #floor #onLineFrom:to: #isPoint #reflectedAbout: #/ #dist: #asNonFractionalPoint #bearingToPoint: #reciprocal #rotateBy:centerAt: #rotateBy:about: #rounded #setX:setY: #squaredDistanceTo: #normalized #veryDeepCopyWith: #- #storeOn: #rect: #deepCopy #isIntegerPoint #min #adhereTo: #adaptToString:andSend:)
- 62. Classes are objects too ! Point instVarNames
- 63. Classes are objects too ! Point instVarNames >#('x' 'y')
- 65. Methods are all late-bound
- 68. Summary • Everything is an object • Single inheritance, public methods, protected attributes • One single model • Classes are simply objects too • A class is instance of another class • One unique method lookup, look in the class of the receiver
- 72. postman send mail recipient
- 73. postman send mail to recipient
- 74. postman send: mail to: recipient
- 75. 2 + 5 2 + 5 > 7 Yes + is a message sent to 2
- 76. Unary messages Binary messages Keywords messages 5 factorial! Transcript cr 3 + 4 3 between: 10 and: 5! ! Transcript show: 'hello world'
- 77. Blocks: Closures all the way • Anonymous method • Passed as method argument or stored • Functions fct(x)= x*x+3, fct(2). ! fct :=[:x| x * x + 3]. fct value: 2 !
- 78. Every control structure is a message 4 timesRepeat: [Beeper beep] max: aNumber! ! ^ self < aNumber ! ! ! ifTrue: [aNumber] ! ! ! ifFalse: [self]
- 79. <= aPoint ! ! "Answer whether the receiver is neither! ! below nor to the right of aPoint."! ! ! ^ x <= aPoint x and: [y <= aPoint y] Method name Argument Comment Return Binary message Keyword messageInstance variable Block (2@3) <= (5@6) true
- 80. Object subclass: #Point! ! instanceVariableNames: 'x y'! ! classVariableNames: ''! ! category: 'Kernel-BasicObjects' 2 instance variables subclass of Object
- 81. Fun with numbers 1 class
- 83. 1 class maxVal > 1073741823
- 84. (1 class maxVal + 1)
- 85. (1 class maxVal + 1) > 1073741824
- 86. (1 class maxVal + 1) class !
- 87. (1 class maxVal + 1) class > LargePositiveInteger
- 88. 1000 factorial >
- 90. 1000 factorial / 999 factorial
- 91. 1000
- 92. 1000
- 95. Check in the system
- 97. Let us hack something…
- 98. (3 D20 + 3 D4) roll
- 99. The Pharo Stack is Gorgeous Voyage/ DBXTalk / Mongo / (Gemstone :) Magritte Zinc, Zodiac(HTTPS), Oauth, ... STON, JSON, LDAP... Seaside, Rest, Zinc Rest, Illiad, Aida, Reef Amber!
- 100. Dynamic Web Applications with Seaside ! http://seaside.st
- 101. Demo
- 102. 1Natural Flow
- 103. Demo
- 104. <form action="result.html"> <input type="hidden" name="value1" value="<% value1 %>"> <input type="text" name="value2"> <input type="submit" value="OK"> </form> <p> <% value1 + value2 %> </p> <form action="second.html"> <input type="text" name="value1"> <input type="submit" value="OK"> </form> <form action="result.html"> <input type="text" name="value2"> <input type="submit" value="OK"> </form>
- 105. Who cares about HTTP anyway?
- 106. is different
- 107. Concentrate on your application ...
- 108. ... no manual request parsing
- 109. ... no XML configuration files
- 110. 3 user interactions
- 111. 3 lines of code
- 112. value1 := self request: ‘First Number’. value2 := self request: ‘Second Number’. self inform: value1 + value2.
- 113. AB call:A Bx :=
- 114. AB answer:B
- 115. A x :=
- 116. We don’t think in pages ...
- 117. ..., but in stateful components
- 119. Did you notice?
- 120. Web applications
- 121. No URL fiddling
- 122. No request parsing
- 123. Development tools
- 124. Control flow at ease
- 125. On going work • Working bootstrap for pharo reflective core • Customized images (11k) • First class variables for real • associations • data flow model
- 126. Glimpse on going work • Package catalog • Git (the right subset) • OSWindow (SDL) • Multi touch support • Full vector graphics
- 127. VM • Spur: new memory manager (got *4 speed up) • ephemerons, pinned object, fragmented memory, 64 bits • Sista: next level JIT • inliner, constant propagation… • Unified FFI + threaded • one syntax several back-ends
- 128. Fun, simple Pure & elegant Productive Empowering Addictive Full access
- 129. Creating good energy, software quality, learning and having fun ! http://pharo.org Join