I know, I know, all ruby posts should be about slightly new takes on testing paradigms or other amazing best practices, but sometimes I think we skip the basiscs. Today it’s
ActiveSupport, the Rails extensions to ruby’s standard library introduce the method
blank?. It’s pretty handy, and I think people tend to take it for granted without realizing exactly what its semantics are.
blank? is handy if you want to treat an empty string, array, or hash as false.
Here’s a slightly haphazard table showing
blank? all work.
|[  ]||FALSE||FALSE||FALSE||[ nil ]||FALSE||FALSE||FALSE|
|[ 1 ]||FALSE||FALSE||FALSE|
So if you want a flexible way of testing whether something exists,
blank? will often give you what you want. I’m sure that was just thrilling!