Implemented typeof and added resetInterpreter()

docs/TODO.txt

@@ -31,17 +31,18 @@ DONE: are compounds shallow or deep copies? Deep copies
 DONE: third output stream, for lexer/parser/compiler/interpreter errors
 DONE: Assertion-based test scripts
 DONE: Import/export keywords
+DONE: A way to check the type of a variable (typeOf keyword)
 
 
 TODO: slice and dot notation around the builtin _index function
 TODO: ternary operator
 TODO: Nullish types?
-TODO: A way to check the type of a variable (typeOf keyword)
-TODO: a = b = c = 1; ?
+TODO: hooks on the external libraries, triggered on import
 TODO: standard library
 TODO: external script runner library
 TODO: document how it all works - book?
 TODO: maximum recursion/function depth
 
 
+NOPE: a = b = c = 1;
 NOPE: functions return a set number of values