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website development website development delete("doomedFile") Class methods are distinguished from instance methods by their definition. Class methods are defined by placing the class name and a period in front of the method name. class Example def instMeth # instance method end def Example.classMeth # class method end end Jukeboxes charge money for each song played, not by the minute. That makes short songs more profitable than long ones.

website development We may want to prevent songs that take too long from being available on the SongList. We could define a class method in SongList that checked to see if a particular song exceeded the limit. We'll set this limit using a class constant, which is simply a constant (remember constants? they start with an uppercase letter) that is initialized in the class body. class SongList MaxTime = 5*60 # 5 minutes def SongList.isTooLong(aSong) return aSong.

website development duration > MaxTime end end song1 = Song.new("Bicylops", "Fleck", 260) SongList.isTooLong(song1) » false song2 = Song.new("The Calling", "Santana", 468) SongList.isTooLong(song2) » true Singletons and Other Constructors Sometimes you want to override the default way in which Ruby creates objects.

website development As an example, let's look at our jukebox. Because we'll have many jukeboxes, spread all over the country, we want to make maintenance as easy as possible. Part of the requirement is to log everything that happens to a jukebox: the songs that are played, the money received, the strange fluids poured into it, and so on. Because we want to reserve the network bandwidth for music, we'll store these logfiles locally. This means we'll need a class that handles logging.

website development

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website development