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ssh2 host access ssh2 host access These externally visible facets of an object are called its attributes. For our Song objects, the first thing we may need is the ability to find out the title and artist (so we can display them while the song is playing) and the duration (so we can display some kind of progress bar). class Song def name @name end def artist @artist end def duration @duration end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.artist » "Fleck" aSong.

ssh2 host access name » "Bicylops" aSong.duration » 260 Here we've defined three accessor methods to return the values of the three instance attributes. Because this is such a common idiom, Ruby provides a convenient shortcut: attr_reader creates these accessor methods for you. class Song attr_reader :name, :artist, :duration end aSong = Song.new("Bicylops", "Fleck", 260) aSong.

ssh2 host access artist » "Fleck" aSong.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.

ssh2 host access In this example, we named the accessor methods name, artist, and duration. 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).

ssh2 host access

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ssh2 host access