A short introduction to Smalltalk during Bar Camp Hanoi 2009. I use some slides of Alexandre Bergel for this presentation. I you want to more information about Smalltalk in Vietnam, you can contact me.

1. Smalltalk
Serge Stinckwich
(Serge.Stinckwich@esug.org)

2. The origin of Smalltalk
Alan Kay’s Dynabook project (1968)
Alto —!Xerox PARC (1973)

3. Smalltalk today

4. Smalltalk today

5. Smalltalk today

6. Smalltalk today

7. Smalltalk today

8. Squeak resources
www.squeak.org www.seaside.st
Downloads and links One-click image
SqueakByExample.org
Free download — Print-on-demand

9. Getting started

10. Everything is an object

11. Everything happens by sending
messages

12. Running Squeak

13. Do it, print it
You can evaluate any
expression anywhere
in Smalltalk

14. Standard development tools

15. Debuggers, Inspectors, Explorers

16. Syntax in a Nutshell

17. Three kind of messages
5 factorial
Unary messages Transcript cr
Binary messages 3+4
Keyword messages
3 raisedTo: 10 modulo: 5
Transcript show: 'hello world'

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

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

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

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

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

23. Smalltalk ressources
• Mailing-list : http://
lists.squeakfoundation.org/mailman/listinfo/
smalltalk-vn
• Smalltalk flyer translated in Vietnamese
• http://community.ofset.org/wiki/Squeak