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Ruby Course —animmersive programming course—

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Licence Copyrightc 2004-2006 Brian Schroeder Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1 ...

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Ruby Course —animmersive programming course— Sommercampus 2005-Albert Ludwigs Universität Freiburg Brian Schröder mail@brian-schroeder.de Licence Copyrightc 2004-2006 Brian Schroeder Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled"GNU Free Documentation License". Part I Introduction Brian Schröder Ruby Course2004 Simple hello world example This is a must 1 #!/usr/bin/ruby 2 3 puts Hello World 1 Hello World Brian Schröder Ruby Course2004 Function definition Functions are defined using thedefkeyword 1 #!/usr/bin/ruby 2 3 def hello (programmer) 4 puts" Hello #{programmer} " 5 end 6 7 hello( Brian ) 1 Hello Brian Brian Schröder Ruby Course2004 In ruby everything is an object Everything is an object, so get used to the ".method"notation. 1 (5.6).round »6 2 (5.6).class » Float 3 (5.6).round.class » Fixnum 4 5 a string .length »8 6 a string .class » String 7 tim tells .gsub( t , j ) »" jim jells " 8 9 abc .gsub( b , xxx ).length »5 10 11 [ some , things , in , an , array ].length »5 12 [ some , things , in , an , array ].reverse »[" array ", " an ", " in ", " things ", " some "] 13 14 #Youcanevenwrite 15 1.+(2) »3 16 17 #butthereissome sugar for cases like this 18 1+2 »3 Brian Schröder Ruby Course2004 Class definition and inheritance Base Class 1 class Person 2 def initialize (name) 3 @name =name 4 end 5 6 def greet 7 " Hello, my name is #{@name} . " 8 end 9 end 10 11 brian= Person .new( Brian ) 12 puts brian.greet 1 Hello, my name is Brian. Sub Class 13 class Matz < Person 14 ...

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