Reserved words within JScript cannot be used for variable or function names. They are
| • break | • function |
| • case | • if |
| • catch | • import |
| • class | • in |
| • const | • new |
| • continue | • null |
| • debugger | • return |
| • default | • super 9 |
| • delete | • switch |
| • do | • this |
| • else | • throw |
| • enum | • try |
| • export | • typeof |
| • extends | • var |
| • false | • void |
| • finally | • while |
| • for | • with |