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affordable web site hosting affordable web site hosting product » 120 Although blocks are often the target of an iterator, they also have other uses. Let's look at a few. Blocks for Transactions Blocks can be used to define a chunk of code that must be run under some kind of transactional control. For example, you'll often open a file, do something with its contents, and then want to ensure that the file is closed when you finish. Although you can do this using conventional code, there's an argument for making the file responsible for closing itself.

affordable web site hosting We can do this with blocks. A naive implementation (ignoring error handling) might look something like the following. class File def File.openAndProcess(*args) f = File.open(*args) yield f f.

affordable web site hosting close() end end File.openAndProcess("testfile", "r") do |aFile| print while aFile.gets end produces: This is line one This is line two This is line three And so on...

affordable web site hosting This small example illustrates a number of techniques. The openAndProcess method is a class method---it may be called independent of any particular File object. We want it to take the same arguments as the conventional File.open method, but we don't really care what those arguments are. Instead, we specified the arguments as *args, meaning ``collect the actual parameters passed to the method into an array.

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