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website developer 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.
website developer 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).
website developer to_i end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.durationInMinutes » 4.333333333 aSong.durationInMinutes = 4.
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