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