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website developer website developer name » "Bicylops" aSong.duration » 260 This example has introduced something new. The construct :artist is an expression that returns a Symbol object corresponding to artist. You can think of :artist as meaning the name of the variable artist, while plain artist is thevalue of the variable. In this example, we named the accessor methods name, artist, and duration.

website developer 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.

website developer 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(....

website developer ) 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.

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