Question

I would like to know how Rails handles the method blank?.

I was trying to build my own blank? equivalent method but it’s not easy. Here’s my try:

def my_blank(state)
  if state == nil or state.empty? == true
     true
  else
     false
  end

end

Answer 1

This project is open source, so just take a look at the source: https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/object/blank.rb

You’ll see that there are individual methods written for the various classes (like String, Array, etc.)