NilClass

nil is blank:

nil.blank? # => true

@return [true]

📝 Source code

# File activesupport/lib/active_support/core_ext/object/blank.rb, line 57
  def blank?
    true
  end

🔎 See on GitHub

nil is not duplicable:

nil.duplicable? # => false
nil.dup         # => TypeError: can't dup NilClass

📝 Source code

# File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 40
    def duplicable?
      false
    end

🔎 See on GitHub

Returns self.

📝 Source code

# File activesupport/lib/active_support/core_ext/object/to_query.rb, line 20
  def to_param
    self
  end

🔎 See on GitHub

Calling try on nil always returns nil. It becomes especially helpful when navigating through associations that may return nil.

nil.try(:name) # => nil

Without try

@person && @person.children.any? && @person.children.first.name

With try

@person.try(:children).try(:first).try(:name)

📝 Source code

# File activesupport/lib/active_support/core_ext/object/try.rb, line 138
  def try(*args)
    nil
  end

🔎 See on GitHub

Calling try! on nil always returns nil.

nil.try!(:name) # => nil

📝 Source code

# File activesupport/lib/active_support/core_ext/object/try.rb, line 145
  def try!(*args)
    nil
  end

🔎 See on GitHub

NilClass < Object