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inexpensive web hosting church 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. Blocks for Transactions Blocks can be used to define a chunk of code that must be run under some kind of transactional control.
inexpensive web hosting church 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. class File def File.
inexpensive web hosting church openAndProcess(*args) f = File.open(*args) yield f f.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.
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