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#!/usr/local/bin/ruby -w # # # def call_each animals = %w{ant bee cat dog elk} for animal in animals yield animal end end call_each {|animal_block| puts animal_block} |
attr_reader,attr_writer
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#!/usr/local/bin/ruby -w # class Song attr_reader :name,:artist,:duration attr_writer :name def initialize(name,artist,duration) @name = name @artist = artist @duration = duration end #same as attr_reader:name #def name # @name #end #same as attr_writer:artist def artist=(new_artist) @artist=new_artist end def to_s "Song:#@name--#@artist(#@duration)" end def duration_in_minutes @duration/60.0 end def duration_in_minutes=(new_duration) @duration = (new_duration*60).to_i end end song=Song.new("Bicyclops","Fleck",260) puts song.to_s puts song.name song.name = "abc" puts song.name puts song.duration_in_minutes song.duration_in_minutes = 6 puts song.duration_in_minutes puts song.duration puts song.artist song.artist="gaga" puts song.artist |