This is handy for any representation of objects where blank is the same as not present at all. For example, this simplifies a common check for HTTP POST/query parameters:
state = params[:state] if params[:state].present? country = params[:country] if params[:country].present? region = state || country || 'US'
# File activesupport/lib/active_support/core_ext/object/blank.rb, line 37 def presence self if present? end