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Methods
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Instance Public methods
blank?()

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?()

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()

Returns self.

# File activesupport/lib/active_support/core_ext/object/to_query.rb, line 18
def to_param
  self
end
try(*args)

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 activesupport/lib/active_support/core_ext/object/try.rb, line 71
def try(*args)
  nil
end
try!(*args)
# File activesupport/lib/active_support/core_ext/object/try.rb, line 75
def try!(*args)
  nil
end