s = 'A string'
length_method = s.method('length') # => #
length_method.arity # => 0
length_method.call # => 8
p 1.method(:succ).call # => 2
p 5.method('+').call(10) # => 15
p [1,2,3].method(:each).call { |x| puts x }
# 1
# 2
# 3