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browser-based website design browser-based website design Second, the actions performed when a button is pressed are expressed at the wrong level; they are not a feature of the button, but are a feature of the jukebox that uses the buttons. We can fix both of these problems using blocks. class JukeboxButton < Button   def initialize(label, &action)     super(label)     @action = action   end   def buttonPressed     @action.call(self)   end end bStart = JukeboxButton.new("Start") { songList.

browser-based website design start } bPause = JukeboxButton.new("Pause") { songList.pause } The key to all this is the second parameter to . If the last parameter in a method definition is prefixed with an ampersand (such as ), Ruby looks for a code block whenever that method is called. That code block is converted to an object of class and assigned to the parameter.

browser-based website design You can then treat the parameter as any other variable. In our example, we assigned it to the instance variable . When the callback method is invoked, we use the method on that object to invoke the block. So what exactly do we have when we create a object? The interesting thing is that it's more than just a chunk of code. Associated with a block (and hence a object) is all the context in which the block was : the value of , and the methods, variables, and constants in scope.

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