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ssh2 hosting ssh2 hosting class Song   attr_writer :duration end aSong = Song.new("Bicylops", "Fleck", 260) aSong.duration = 257 Virtual Attributes These attribute accessing methods do not have to be just simple wrappers around an object's instance variables. For example, you might want to access the duration in minutes and fractions of a minute, rather than in seconds as we've been doing. class Song   def durationInMinutes     @duration/60.

ssh2 hosting 0   # force floating point   end   def durationInMinutes=(value)     @duration = (value*60).to_i   end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.durationInMinutes 4.333333333 aSong.

ssh2 hosting durationInMinutes = 4.2 aSong.duration 252 Here we've used attribute methods to create a virtual instance variable. To the outside world, durationInMinutes seems to be an attribute like any other. Internally, though, there is no corresponding instance variable.

ssh2 hosting This is more than a curiosity. In his landmark book Object-Oriented Software Construction , Bertrand Meyer calls this the Uniform Access Principle. By hiding the difference between instance variables and calculated values, you are shielding the rest of the world from the implementation of your class. You're free to change how things work in the future without impacting the millions of lines of code that use your class. This is a big win.

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