[Ruby袖珍参考手册].(Ruby.Pocket.Reference).Michael.Fitzgerald.文字版

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1、RubyPocketReferenceMichaelFitzgeraldBeijing•Cambridge•Farnham•Köln•Paris•Sebastopol•Taipei•TokyoRubyPocketReferencebyMichaelFitzgeraldCopyright©2007MichaelFitzgerald.Allrightsreserved.PrintedinCanada.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebastopol,CA95472.O’Reillybooksmaybepurch

2、asedforeducational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(safari.oreilly.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:(800)998-9938orcorporate@oreilly.com.Editor:SimonSt.LaurentCoverDesigner:KarenMontgomeryProductionEditor:InteriorDesig

3、ner:DavidFutatoRachelMonaghanIllustrators:RobertRomanoandProofreader:RachelMonaghanJessamynReadIndexer:EllenTroutmanZaigPrintingHistory:July2007:FirstEdition.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.ThePocketReferenceseriesdesignations,Rub

4、yPocketReference,theimageofagiraffe,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellerstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.wasawareofatrademarkclaim,thedesignationshavebeenpri

5、ntedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenoresponsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcontainedherein.ISBN-10:0-596-51481-6ISBN-13:978-0-596-51481-5[TM]ContentsRunningRuby2RunningtheRubyInterp

6、reter3UsingaShebangLineonUnix/Linux5AssociatingFileTypesonWindows5ReservedWords7Operators9Comments10Numbers11Variables11LocalVariables12InstanceVariables12ClassVariables13GlobalVariables13Constants13ParallelAssignmentofVariables13Symbols14PredefinedVariables14Pseudovariables17GlobalConstants18iiiRan

7、ges19Methods19Parentheses20ReturnValues20MethodNameConventions21DefaultArguments22VariableArguments22AliasingMethods23Blocks23Procs25ConditionalStatements27TheifStatement27TheunlessStatement29Thewhile