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For this audience it may be worth noting that Ruby’s blocks are closures and are passed to method... For this audience it may be worth noting that Ruby’s blocks are closures and are passed to methods either anonymously/implicitly or as a named parameter, may be subsequently passed around to any collaborator object, or otherwise deferred/ignored, have the same range of argument arity as methods and lambdas, can even be formed from (and treated similarly to) lambdas, and are thereby fundamental to