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website hosting services website hosting services In this case we'll add it to the Array class, while on page 100 we'll see how to make it more generally available. class Array   def inject(n)      each { |value| n = yield(n, value) }      n   end   def sum     inject(0) { |n, value| n + value }   end   def product     inject(1) { |n, value| n * value }   end end [ 1, 2, 3, 4, 5 ].sum 15 [ 1, 2, 3, 4, 5 ].product 120 Although blocks are often the target of an iterator, they also have other uses. Let's look at a few.

website hosting services 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. We can do this with blocks. A naive implementation (ignoring error handling) might look something like the following.

website hosting services class File   def File.openAndProcess(*args)     f = File.open(*args)    yield f     f.close()   end end File.openAndProcess("testfile", "r") do |aFile|   print while aFile.

website hosting services gets end produces: This is line one This is line two This is line three And so on... 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.

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