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create web site create web site duration » 257 The assignment ``aSong.duration = 257'' invokes the method duration= in the aSong object, passing it 257 as an argument. In fact, defining a method name ending in an equals sign makes that name eligible to appear on the left-hand side of an assignment. Again, Ruby provides a shortcut for creating these simple attribute setting methods. class Song   attr_writer :duration end aSong = Song.

create web site 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/60.0   # force floating point   end   def durationInMinutes=(value)     @duration = (value*60).

create web site to_i   end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.durationInMinutes » 4.333333333 aSong.durationInMinutes = 4.

create web site 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. This is more than a curiosity.

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