thoughtbot/guides — pull request #99 by calebthompson (2013-06-24 14:26:27+00:00)
Title: Use present? and blank? in conditionals

Using `present?` or `blank?` in conditionals has several benefits:

1. Allows for the use of Null Objects 2. Makes it easier to keep conditionals
positive, avoiding `unless` 3. Clarifies the intention of the conditional