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start web wide world start web wide world Associated with a block (and hence a Proc object) is all the context in which the block was defined: the value ofself, and the methods, variables, and constants in scope. Part of the magic of Ruby is that the block can still use all this original scope information even if the environment in which it was defined would otherwise have disappeared. In other languages, this facility is called a closure. Let's look at a contrived example. This example uses the method proc, which converts a block to a Proc object.

start web wide world def nTimes(aThing) return proc { |n| aThing * n } end p1 = nTimes(23) p1.call(3) » 69 p1.call(4) » 92 p2 = nTimes("Hello ") p2.call(3) » "Hello Hello Hello " The method nTimes returns a Proc object that references the method's parameter, aThing. Even though that parameter is out of scope by the time the block is called, the parameter remains accessible to the block.

start web wide world Web Hosting Tips for Webmasters - SEO One-Way Web Links: 5 Strategies Article printed from SiteProNews: http://www.sitepronews.com HTML version available at: http://www.sitepronews.com/archives.

start web wide world html SEO One-Way Web Links: 5 Strategies By Joel Walsh (c) 2005 With so much talk about search engines putting a damper on direct reciprocal links, the hunt for the elusive one-way inbound link is on. As someone who works with small business website owners, I've heard just about every inbound-linking scheme there is. In the end, I've only seen five strategies that really work consistently for getting hundreds of links. Less Effective One-Way Link Strategies Yet there's perennial interest in alternative linking strategies. They range from bad to OK, but none offer as much potential as the five major ways of getting links.

start web wide world

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