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cheap jsp website hosting So, it seems natural to be able to assign to these variables when you want to set the value of an attribute. In keeping with the Principle of Least Surprise, that's just what you do in Ruby. class Song def duration=(newDuration) @duration = newDuration end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.duration » 260 aSong.
cheap jsp website hosting 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. Again, Ruby provides a shortcut for creating these simple attribute setting methods.
cheap jsp website 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.
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