class NilClass

Public Instance Methods

blank?() click to toggle source

nil is blank:

nil.blank? # => true

@return [true]

# File lib/active_support/core_ext/object/blank.rb, line 53
def blank?
  true
end
duplicable?() click to toggle source

nil is not duplicable:

nil.duplicable? # => false
nil.dup         # => TypeError: can't dup NilClass
# File lib/active_support/core_ext/object/duplicable.rb, line 34
def duplicable?
  false
end
to_param() click to toggle source

Returns self.

# File lib/active_support/core_ext/object/to_param.rb, line 10
def to_param
  self
end
try(*args) click to toggle 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 && !@person.children.blank? && @person.children.first.name

With try

@person.try(:children).try(:first).try(:name)
# File lib/active_support/core_ext/object/try.rb, line 71
def try(*args)
  nil
end
try!(*args) click to toggle source
# File lib/active_support/core_ext/object/try.rb, line 75
def try!(*args)
  nil
end