Dealing with Nil

As a Ruby programmer the most common value you'll encounter will be `nil`. It's our duty to be on constant watch for `nil` and make sure it doesn't reek havoc on our code. This video will introduce you to some boolean logic we can use to defend against the tyranny of nil. We'll then cover using `nil?` and `empty?` as well as several custom Active Support methods we can use from Rails to help guard against nil. Nil isn't all bad, at the end we'll see how we can use this functionality of nil to populate variables only if they don't exist. We'll use this to find or create a user in Rails.

http://schneems.com/ut-rails

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