website development

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website development website development But say we also want to know how many songs have been played in total. We could do this by searching for all the Song objects and adding up their counts, or we could risk excommunication from the Church of Good Design and use a global variable. Instead, we'll use a class variable. class Song @@plays = 0 def initialize(name, artist, duration) @name = name @artist = artist @duration = duration @plays = 0 end def play @plays += 1 @@plays += 1 "This song: #@plays plays. Total #@@plays plays.

website development " end end For debugging purposes, we've arranged for Song#play to return a string containing the number of times this song has been played, along with the total number of plays for all songs. We can test this easily. s1 = Song.new("Song1", "Artist1", 234) # test songs..

website development s2 = Song.new("Song2", "Artist2", 345) s1.play » "This song: 1 plays. Total 1 plays." s2.

website development play » "This song: 1 plays. Total 2 plays." s1.play » "This song: 2 plays. Total 3 plays.

website development

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website development