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create your own web page create your own web page 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.

create your own web page 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.

create your own web page 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.

create your own web page (We talk about extending Ruby beginning on page 169.) bStart = Button.new("Start") bPause = Button.new("Pause") # ..

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