http://snippets.dzone.com/posts Mon, 06 Oct 2008 12:05:24 GMT DZone Snippets: metaprogramming code http://snippets.dzone.com/posts/show/5321 This code enters the scope of an object, so you can temporarily avoid having to reference it by name. <br /> <br />Effectively changes the value of 'self' in the block scope. This also enables you to run private methods on the object without using __send__. <br /> <br /><code> <br />def with(object, &block) <br /> object.instance_eval(&block) <br />end <br /></code> <br /> <br />Example of usage: <br /><code> <br />numbers = [1, 2, 3] <br /> <br />with numbers do <br /> map! { |n| n + 100 } <br /> reject! { |n| n % 2 == 0} <br />end <br /> <br />p numbers # => [101, 103] <br /> <br />n = 15 <br />n = with n do <br /> self + 13 <br />end <br />p n # => 28 <br /></code> <br /> <br />This gets much more interesting with complex objects that have lots of attributes and you want strict control over how they're set. Thu, 03 Apr 2008 11:03:54 GMT http://snippets.dzone.com/posts/show/5321 vinterbleg (Simon Ask Ulsnes)