private tomcat

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private tomcat

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private tomcat private tomcat The final value of inject is the value returned by the block the last time it was called. Ruby does not have an inject method, but it's easy to write one. 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 ].

private tomcat 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.

private tomcat 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.

private tomcat 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...

private tomcat

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private tomcat