The Pharo Programming Language


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Pharo is a Smalltalk dialect programming language. From the 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."

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The Pharo Programming Language

  1. 1.
  2. 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. 3. Getting started with Pharo
  4. 4. Everything is an object
  5. 5. Everything happens by sending messages to objects
  6. 6. Running Pharo
  7. 7. Do it, print it You can evaluate any expression anywhere in Pharo
  8. 8. Standard development tools
  9. 9. Standard development tools
  10. 10. Debugger, explorer, inspector
  11. 11. Syntax in a nutshell
  12. 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. 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. 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. 15. Control structures Every control structure is realized by message sends 4 timesRepeat: [Beeper beep] max: aNumber ^ self < aNumber ifTrue: [aNumber] ifFalse: [self]
  16. 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. 17. Creating classes Send a message to a class (!) Number subclass: #Complex instanceVariableNames: 'real imaginary' classVariableNames: '' poolDictionaries: '' category: 'ComplexNumbers'
  18. 18. Be involved! Join Pharo • Strong community • Goal: learning and having fun • We need forces on several topics: graphics programming, compilation, virtual machines
  19. 19. Links • Webpage: • Download: • Mailing list: