1 true
   2 TypeError: Cannot get property "foo" of null
   3 true
   4 TypeError: Cannot get property "foo" of null
   5 true
   6 TypeError: Cannot set property "foo" of null
   7 true
   8 TypeError: Cannot set property "foo" of null
   9 true
  10 TypeError: null has no such function "foo"
  11 true
  12 TypeError: null is not a function