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Ruby (IRB INTERACTIVE RUBY). If you’re using Mac OS X open up Terminal and typeirb , then hit enter. If you’re using Linux , open up a shell and typeirb and hit enter. If you’re using Windows , open fxri from the Ruby section of your Start Menu. irb (main):001:0>
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Ruby (IRB INTERACTIVE RUBY) If you’re using Mac OS X open up Terminal and typeirb, then hit enter. If you’re using Linux, open up a shell and typeirb and hit enter. If you’re using Windows, open fxri from the Ruby section of your Start Menu. irb(main):001:0> irb(main):001:0> "Hello World"=> "Hello World“ irb(main):002:0> puts "Hello World"Hello World=> nil irb(main):003:0> 3+2=> 5
irb(main):004:0> 3*2=> 6 • irb(main):005:0> 3**2=> 9 • irb(main):006:0> Math.sqrt(9)=> 3.0
Modules (Group codes by Topic) • Role one: Group similar methods together under a familiar name e.g. Math • Role two: Dot i.e. Receiver of a message
Methods • irb(main):010:0> def hirb(main):011:1> puts “Salam World!"irb(main):012:1> end=> nil • irb(main):019:0> def h(name = "World")irb(main):020:1> puts “Salam #{name.capitalize}!"irb(main):021:1> end=> nilirb(main):022:0> h "chris"Salam Chris!=> nilirb(main):023:0> hSalam World!=> nil
Class • irb(main):024:0> class Greeterirb(main):025:1> def initialize(name = "World")irb(main):026:2> @name = nameirb(main):027:2> endirb(main):028:1> defsay_Salamirb(main):029:2> puts “Salam #{@name}!"irb(main):030:2> endirb(main):031:1> defsay_Wasalamirb(main):032:2> puts “Wasalam #{@name}, come back soon."irb(main):033:2> endirb(main):034:1> end=> nil
