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Null Object Pattern using OpenStruct for simple predefined null objects (PreStep before Monads)
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| # How To Guard Against Ruby Nil Errors | |
| # http://www.littlelines.com/blog/2013/06/22/how-to-guard-against-ruby-nil-errors/ | |
| # Null Object Pattern | |
| # using OpenStruct for simple predefined null objects | |
| require "ostruct" | |
| NullUser = OpenStruct.new(id: -1, name: "Null User") # ... and additional accessors |
Very good generalized approach/gem: https://github.com/tomstuart/monads
(Ref: Talk at eurucamp 2014 -> http://2014.eurucamp.org/speakers/#tom-stuart)
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Another article: http://devblog.avdi.org/2011/05/30/null-objects-and-falsiness/