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create web site create web site In general, this is a Good Thing. It means that the object is solely responsible for maintaining its own consistency. However, an object that is totally secretive is pretty useless---you can create it, but then you can't do anything with it. You'll normally define methods that let you access and manipulate the state of an object, allowing the outside world to interact with the object. These externally visible facets of an object are called its attributes.

create web site 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.name » "Bicylops" aSong.

create web site 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.artist » "Fleck" aSong.

create web site 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.

create web site

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