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low cost private jsp web hosting 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.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.
low cost private jsp web hosting 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. (We talk about extending Ruby beginning on page 169.) bStart = Button.
low cost private jsp web hosting new("Start") bPause = Button.new("Pause") # ... What happens when the user presses one of our buttons? In the Button class, the hardware folks rigged things so that a callback method, buttonPressed, will be invoked.
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