Pharo is a Smalltalk dialect programming language. From the pharo-project.org website: "Pharo's goal is to deliver a clean, innovative, open-source Smalltalk environment. By providing a stable and small core system, excellent developer tools, and maintained releases, Pharo is an attractive platform to build and deploy mission critical Smalltalk applications. Pharo is MIT licensed and is steered by a board of benevolent dictators. The board makes final decisions if no consensus can be reached within the community. Pharo fosters a healthy ecosystem of both private and commercial contributors who advance and maintain the core system and its external packages."

1. http://www.pharo-project.org

2. Pharo in a nutshell
• Pharo = language + IDE + update mechanism
• Pure object-oriented programming language
• Dynamically typed and trait-based
• Open and flexible environment (OB, Polymorph, Scripting)
• Using as executing platform for Seaside and Aida/Web web frameworks

3. Getting started with Pharo

4. Everything is an object

5. Everything happens by sending messages to
objects

6. Running Pharo

7. Do it, print it
You can evaluate
any expression
anywhere
in Pharo

8. Standard development tools

9. Standard development tools

10. Debugger, explorer, inspector

11. Syntax in a nutshell

12. 3 kinds of messages
5 factorial
Unary messages
Transcript cr
Binary messages 3 + 4
Keywords messages
3 raisedTo: 10 modulo: 5
Transcript show: 'hello world'

13. A typical method in Point
Method name Argument Comment
<= aPoint
"Answer whether the receiver is neither
below nor to the right of aPoint."
^ x <= aPoint x and: [y <= aPoint y]
Return Binary message Block
Instance variable Keyword message
(2@3) <= (5@6) true

14. Statement and cascades
Temporary variables
Statement
| p pen |
p := 100@100.
pen := Pen new.
pen up.
pen goto: p; down; goto: p+p
Cascade

15. Control structures
Every control structure is realized by message sends
4 timesRepeat: [Beeper beep]
max: aNumber
^ self < aNumber
ifTrue: [aNumber]
ifFalse: [self]

16. Control structures
Every control structure is realized by message sends
4 timesRepeat: [Beeper beep]
Boolean
ifTrue:ifFalse:
max: aNumber True False
^ self < aNumber ifTrue:ifFalse: ifTrue:ifFalse:
ifTrue: [aNumber]
ifFalse: [self] ifTrue: t ifFalse: f ifTrue: t ifFalse: f
^ t value ^ f value

17. Creating classes
Send a message to a class (!)
Number subclass: #Complex
instanceVariableNames: 'real imaginary'
classVariableNames: ''
poolDictionaries: ''
category: 'ComplexNumbers'

18. Be involved! Join Pharo
• Strong community
• Goal: learning and having fun
• We need forces on several topics: graphics programming, compilation, virtual
machines

19. Links
• Webpage: http://www.pharo-project.org
• Download: http://www.pharo-project.org/download
• Mailing list: http://gforge.inria.fr/mail/?group_id=1299