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private jsp support duration » 260 aSong.duration = 257 # set attribute with updated value aSong.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.
private jsp support Again, Ruby provides a shortcut for creating these simple attribute setting methods. 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.
private jsp support class Song def durationInMinutes @duration/60.0 # force floating point end def durationInMinutes=(value) @duration = (value*60).to_i end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.durationInMinutes » 4.
private jsp support
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