The Pharo Smalltalk Pharo in a Nutshell

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The Pharo Smalltalk http://www.pharo-project.org 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) Used as the executing platform for Seaside Getting started with Pharo Everything is an object Everything happens by sending messages Running Pharo Do it, print it You can evaluate any expression anywhere in Pharo Standard development tools Standard development tools Debugger, explorer, inspector Syntax in a nutshell 3 kinds of messages Unary messages 5 factorial Transcript cr Binary messages 3 + 4 Keyword messages 3 raisedTo: 10 modulo: 5 Transcript show: 'hello world' 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 Statement and cascades Temporary variables Statement | p pen | p := 100@100. pen := Pen new. pen up. pen goto: p; down; goto: p+p Cascade Control structures Every control structure is realized by message sends 4 timesRepeat: [Beeper beep] max: aNumber ^ self < aNumber ifTrue: [aNumber] ifFalse: [self] 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 Creating classes Send a message to a class (!) Number subclass: #Complex instanceVariableNames: 'real imaginary' classVariableNames: '' poolDictionaries: '' category: 'ComplexNumbers' How to join? Join Pharo Strong community Goal: learning and having fun We need forces on several topics: graphics programming, compilation, virtual machines Links Download: http://code.google.com/p/pharo Mailing list: http://gforge.inria.fr/mail/?group_id=1299 .

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