[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Car and Cdr of nil is nil

This was a feature introduced in BBN Lisp around 1968 to allow one to
access, say, the fourth element of a list without checking if the list
was that long.  It is a useful, though terrible, pun.  For very small
machines as we were on, saving the few cons cells at the end of a list
was important.  And after all, one might say, the REST of an empty list
is still empty. ...