[FullyFunctional]

All of this is accurate and just want to add how hard it is to appreciate how revolutionary BASIC was at the time of creation (at Dartmouth, when everything was batch oriented FORTRAN). It was probably the first _widely_ available example of interactive computing, and as we have to come to understand, instant feedback is critical for learning and a boon for productivity.

However, using line numbers for editors wasn't AFAIK unusual at the time and I think making the semantics depend on them was unfortunate. However 20/20 hindsight etc.