class NilClass

# File activesupport/lib/active_support/core_ext/object/blank.rb, line 53
def blank?
  true
end

nil is blank:

nil.blank? # => true

@return [true]

duplicable?() Show source

# File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 38
def duplicable?
  false
end

nil is not duplicable:

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

to_param() Show source

# File activesupport/lib/active_support/core_ext/object/to_query.rb, line 18
def to_param
  self
end

Returns self.

try(*args) Show source

# File activesupport/lib/active_support/core_ext/object/try.rb, line 93
def try(*args)
  nil
end

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)

try!(*args) Show source

# File activesupport/lib/active_support/core_ext/object/try.rb, line 97
def try!(*args)
  nil
end