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Messages from Perl id:aereal Saturday, August 18, 12

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id:aereal[୭?] aereal aereal aereal Saturday, August 18, 12

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Saturday, August 18, 12

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Saturday, August 18, 12

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Ruby Perl JavaScript Saturday, August 18, 12

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I/O Saturday, August 18, 12

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I/O Saturday, August 18, 12

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Io http://iolanguage.com/ Saturday, August 18, 12

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ActionScript C++ PHP ALGOL Fortran COBOL Java C# Objective-C Pascal Haskell Prolog Modula-2 Brainfxxk R Scala Groovy Lua ML Smalltalk OCaml Go Saturday, August 18, 12

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$a <=> $b Saturday, August 18, 12

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Object-oriented Programming Saturday, August 18, 12

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OOP? messaging polymorphism encapsulation Saturday, August 18, 12

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Implementations Simple Expensive Saturday, August 18, 12

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Expensive impl. (1) First-class class and objects Coupling tightly Saturday, August 18, 12

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Expensive impl. (2) Ruby Java Saturday, August 18, 12

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class Car # ... end Saturday, August 18, 12

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Simple impl. (1) Use Dictionary-like data structure Coupling loosely Saturday, August 18, 12

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Simple impl. (2) JavaScript Perl Saturday, August 18, 12

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package Car; sub new { my ($class) = @_; bless +{}, $class; } 1; Saturday, August 18, 12

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Dynamic dispatch Saturday, August 18, 12

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Perl Saturday, August 18, 12

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package Car; sub run { my ($self) = @_; print “run\n”; } Saturday, August 18, 12

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my $car = Car->new; run $car; Saturday, August 18, 12

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Indirect object syntax Saturday, August 18, 12

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Implicitly take arguments Perl Python Saturday, August 18, 12

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Ruby Saturday, August 18, 12

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class Car def run puts “run” end end Saturday, August 18, 12

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car = Car.new car.send(“run”) Saturday, August 18, 12

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run = car.method(“run”) run.call Saturday, August 18, 12

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#receiver -> object #owner -> class Method#.* Saturday, August 18, 12

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Method instances know receiver Saturday, August 18, 12

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Conclusions Many ‘Objects’ Implementations are constraints You should be multi-lingual Saturday, August 18, 12

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͓͠·͍ Saturday, August 18, 12