browser-based website construction

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browser-based website construction browser-based website construction » » Although blocks are often the target of an iterator, they also have other uses. Let's look at a few. 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.

browser-based website construction 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.

browser-based website construction close() end end File.openAndProcess("testfile", "r") do |aFile| print while aFile.gets end This is line one This is line two This is line three And so on...

browser-based website construction

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browser-based website construction