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website hosting services website hosting services .}''. We discuss the impact of this on page 234. The technique of having files manage their own lifecycle is so useful that the class File supplied with Ruby supports it directly. If File.

website hosting services open has an associated block, then that block will be invoked with a file object, and the file will be closed when the block terminates. This is interesting, as it means that File.open has two different behaviors: when called with a block, it executes the block and closes the file. When called without a block, it returns the file object. This is made possible by the method Kernel::block_given? , which returns true if a block is associated with the current method.

website hosting services Using it, you could implement File.open (again, ignoring error handling) using something like the following. class File   def File.myOpen(*args)     aFile = File.new(*args)     # If there's a block, pass in the file and close    # the file when it returns     if block_given?       yield aFile       aFile.

website hosting services close       aFile = nil     end     return aFile  end end Blocks Can Be Closures Let's get back to our jukebox for a moment (remember the jukebox?). At some point we'll be working on the code that handles the user interface---the buttons that people press to select songs and control the jukebox. We'll need to associate actions with those buttons: press STOP and the music stops. It turns out that Ruby's blocks are a convenient way to do this. Let's start out by assuming that the people who made the hardware implemented a Ruby extension that gives us a basic button class.

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