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create web site create web site The corresponding instance variables, @name, @artist, and @duration, will be created automatically. These accessor methods are identical to the ones we wrote by hand earlier. Writable Attributes Sometimes you need to be able to set an attribute from outside the object. For example, let's assume that the duration that is initially associated with a song is an estimate (perhaps gathered from information on a CD or in the MP3 data). The first time we play the song, we get to find out how long it actually is, and we store this new value back in the Song object.

create web site In languages such as C++ and Java, you'd do this with setter functions. class JavaSong { // Java code private Duration myDuration; public void setDuration(Duration newDuration) { myDuration = newDuration; } } s = new Song(....

create web site ) s.setDuration(length) In Ruby, the attributes of an object can be accessed as if they were any other variable. We've seen this above with phrases such as aSong.name. So, it seems natural to be able to assign to these variables when you want to set the value of an attribute.

create web site 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.duration = 257 # set attribute with updated value aSong.

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