RubyProgrammingLanguage

RubyScriptinglanguage,dynamicandobjectoriented

Allowsrapiddevelopmentandrapidprototypesofsoftware

Consistsofusefulstringoperationsandregularexpressions

EverythinginRubyisanobject

Hasautomaticgarbagecollection

Instantfeedbackwhendeveloping

MultipleOSsupportandopensource

RubyProgrammingLanguage

History

BornFeb23,1993YukihiroMatzMatsumoto

Ruby0.95announcedDec21,1995OO,Inheritance,iterators,exceptionhandling,garbagecollection

Ruby1.0releasedDec25,1996

Ruby1.31999AfteritsreleaseanEnglishRubymailinglistwascreated

RubyonRails2005MVCwebframeworkcodedwithRuby

Ruby1.9.1Latestversion

RubyProgrammingLanguage

Philosophy

Rubyissimpleinappearance,butisverycomplexinside,justlikeourhumanbodyMatz

POLSPrincipleofLeastSurpriseDesignthelanguagesoexperiencedProgrammershaveminimalconfusion.

RubyProgrammingLanguage

RubyinAction

ToexecuteRubycodeusetheIRB(interativerubyinterpreter)orfromaTerminaltype:%rubyfilename.rb

ClassicHelloWorldexampleusingirb::

c@claptop:~$irbirb(main):001:0>puts"HelloWorld"HelloWorld=>nil

Usingafilenamedhello.rb

c@claptop:~/Documents/cs183$rubyhello.rbHelloWorld

RubyProgrammingLanguage

RubyinBasics

Output:printrubyrocksputsrubyrocks//insertsaCRandend

Functions:defwelcome(name)

putshey#{name}end

:Functionswithmultiplereturnvalues:

defget_cost_mpgcost=20mpg=20Returncost,mpg

endHum_cost,Hum_mpg=get_cost_mpg

RubyProgrammingLanguage

RubyinBasics

Variables:Globalsprefixwitha'$'Instancevarsprefixwitha'@'

Comments:use'#'

SinceeverythinginRubyisanobjectwecanapplymethods:1.5.floor()=>1

if(x>7&&x

RubyProgrammingLanguage

RubyinBasics

grade=10school=casegradewhen0..5"elementary"when6..8"middleschool"when9..12"highschool"else"college"end

.

foriin1..4puts"hi#{i}"end

ArrayLoopusing'each'

animals=%w(lionstigersbears)animals.each{|kind|printkind}

RubyProgrammingLanguage

RubyClass

classPersondefinitialize(fname,lname)@fname=fname@lname=lnameenddefto_s"Person:#@fname#@lname"endendperson=Person.new("Augustus","Bondi")printperson

RubyProgrammingLanguage

RubyFileIO

Performafile>stringoperation:Easyas:file=File.new("t1.php")mytext=file.read

Breakdownthefileintoanarrayoflines:lines=IO.readlines("data.txt")putslines[0]#printsthefirstline

Outputfilecontents:IO.foreach("data.txt"){|line|putsline}

RubyProgrammingLanguage

RubyHTMLExtractorExample

require'openuri'open('http://www.soe.ucsc.edu/classes/cmps183/Spring10/'){|f|printf.read}

BenefitsofRuby:Cleancode,Easytolearn,Documentionandsupport,OpenSource,OO

DrawbacksofRuby:Interpreted{Read;Eval;Loop;}Performance

RubyProgrammingLanguage

Links

http://www.fincher.org/tips/Languages/Ruby/

http://www.rubylang.org/en/about/

http://www.rubylang.org/en/documentation/quickstart/

http://en.wikipedia.org/wiki/Ruby_%28programming_language%29

http://articles.sitepoint.com/article/learnrubyonrails

http://www.fincher.org/tips/Languages/Ruby/http://www.ruby-lang.org/en/about/http://www.ruby-lang.org/en/documentation/quickstart/http://en.wikipedia.org/wiki/Ruby_%28programming_language%29http://articles.sitepoint.com/article/learn-ruby-on-rails

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