Pharo is a pure object-oriented programming language that features a flexible environment and a standard set of development tools, including a debugger and an inspector. It operates on the principle that everything is an object, and all actions are performed through message sending. The document encourages community involvement and provides links for further engagement with the Pharo ecosystem.

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