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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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