W3cubDocs

class NilClass

nil is blank:

nil.blank? # => true

@return [true]

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

duplicable?() Show source

nil is not duplicable:

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

# File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 34
def duplicable?
  false
end

to_param() Show source

Returns self.

# File activesupport/lib/active_support/core_ext/object/to_query.rb, line 17
def to_param
  self
end

try(*args) Show source

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

nil.try(:name) # => nil

Without try

@person && [email protected]? && @person.children.first.name

With try

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

# File activesupport/lib/active_support/core_ext/object/try.rb, line 71
def try(*args)
  nil
end

try!(*args) Show source

# File activesupport/lib/active_support/core_ext/object/try.rb, line 75
def try!(*args)
  nil
end