A presentation done to the functional programming language meeting from Prague.

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

18. www.2denker.de
www.agilitic.com
www.airflowing.com
www.anymorphic.com
www.ardishealth.com
www.beta9.be
www.bombardier.com
www.cmsbox.com
www.finworks.biz
seaside.gemstone.com
www.ibizlog.com
www.inceptive.be
www.jooshr.com
www.majcon.de
www.mindclue.ch
www.miriamtech.com
www.myneat.org
www.netstyle.ch
www.panasoft.com
www.pinesoft.co.uk
www.promedmedical.net
www.sharedlogic.ca
www.smallworks.com.ar
www.10pines.com
www.trantaria.com
www.yesplan.be
www.synectique.eu
www.sorabito.com
objectprofile.com
!
Companies

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

20. Some success stories…

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

28. NTed: disaster scenario
recovery

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

46. http://youtu.be/CuimMwuZiGA

47. Scripting live
https://www.youtube.com/watch?v=1Nze9tnwYxY

48. http://www.pharocasts.com/2010/08/see-how-to-get-
data-from-url-parse-xml.html

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')

64. Methods are public

65. Methods are all late-bound

66. Instance variables are
protected

67. Single Inheritance

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

69. Messages + Objects

70. postman.send(mail,recipient);

71. postman.send(mail,recipient);

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

82. 1 class
> SmallInteger

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
>

89. 1000 factorial
>
4023872600770937735437024339230039857193748642107146325437999104299385123986290205920442084869694048004799886101
9719605863166687299480855890132382966994459099742450408707375991882362772718873251977950595099527612087497546249
7043601418278094646496291056393887437886487337119181045825783647849977012476632889835955735432513185323958463075
5574091142624174743493475534286465766116677973966688202912073791438537195882498081268678383745597317461360853795
3452422158659320192809087829730843139284440328123155861103697680135730421616874760967587134831202547858932076716
9132448426236131412508780208000261683151027341827977704784635868170164365024153691398281264810213092761244896359
9287051149649754199093422215668325720808213331861168115536158365469840467089756029009505376164758477284218896796
4624494516076535340819890138544248798495995331910172335555660213945039973628075013783761530712776192684903435262
5200015888535147331611702103968175921510907788019393178114194545257223865541461062892187960223838971476088506276
8629671466746975629112340824392081601537808898939645182632436716167621791689097799119037540312746222899880051954
4441428201218736174599264295658174662830295557029902432415318161721046583203678690611726015878352075151628422554
0265170483304226143974286933061690897968482590125458327168226458066526769958652682272807075781391858178889652208
1643483448259932660433676601769996128318607883861502794659551311565520360939881806121385586003014356945272242063
4463179746059468257310379008402443243846565724501440282188525247093519062092902313649327349756551395872055965422
8749774011413346962715422845862377387538230483865688976461927383814900140767310446640259899490222221765904339901
8860185665264850617997023561938970178600408118897299183110211712298459016419210688843871218556461249607987229085
1929681937238864261483965738229112312502418664935314397013742853192664987533721894069428143411852015801412334482
8015051399694290153483077644569099073152433278288269864602789864321139083506217095002597389863554277196742822248
7575867657523442202075736305694988250879689281627538488633969099598262809561214509948717012445164612603790293091
2088908694202851064018215439945715680594187274899809425474217358240106367740459574178516082923013535808184009699
6372524230560855903700624271243416909004153690105933983835777939410970027753472000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

90. 1000 factorial / 999 factorial

91. 1000

92. 1000

93. Learning from the
system…

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

118. Valid
Source:stock.xchng,AlNakib

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