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  1. or download this
    > a = { b : {} };

...
> f = a.b.c.d.e
  Uncaught TypeError: Cannot read properties of undefined (reading 'd'
+)
    at <anonymous>:1:11
  2. or download this
    > a["b"]["c"]["d"]["e"] ="X"
  Uncaught TypeError: Cannot read properties of undefined (reading 'd'
+)
...
 Uncaught TypeError: Cannot read properties of undefined (reading 'd')
    at <anonymous>:1:7
  3. or download this
    > perl -de0
...
...
      'c' => HASH(0x3244130)
         'd' => 'X'
  DB<3>