Master of nil

all_about_nil.md

Further reading on nil in Ruby & Rails

Ruby: Is nil?

• Lukasz Wrobel demystifies nil in Ruby

Why the id of nil is 4 in Ruby

• An older post by Neeraj Singh on nil's object_id

a World Without Nil

If You Gaze Into nil, nil Gazes Also Into You

try(), try() again in Rails

Null Objects and Falsiness

Rails Refactoring Example: Introduce Null Object

Understanding .nil? .empty? .blank? .present? in Ruby on Rails

How To Guard Against Ruby Nil Errors

Don't Fail at Failure in Ruby

Navigating nil (Method Chaining) in Ruby

Eliminating branching, nil and attributes - let's get weird

Question: rails if object.nil? then magic '' in views?

Naught — a toolkit for building NullObject classes in Ruby

Boolean to_i feature rejection

• This is particularly interesting because Matz gives a succinct answer that explains what he intends nil to be and true and false to not be:

Ruby is not C. 0 is not false. false is not 0. nil has its role as a default value, true/false are not.