Difference between __callee__ and __method__

Question

In Ruby, one can use either

__callee__ 

or

__method__ 

to find the name of the currently executing method.<

Answer 1

__method__ looks up the name statically, it refers to the name of the nearest lexically enclosing method definition. __callee__ looks up the name dynamically, it refers to the name under which the method was called. Neither of the two necessarily needs to correspond to the message that was originally sent:

class << (foo = Object.new)
  def bar(*) return __method__, __callee__ end
  alias_method :baz, :bar
  alias_method :method_missing, :baz
end

foo.bar # => [:bar, :bar]
foo.baz # => [:bar, :baz]
foo.qux # => [:bar, :method_missing]