any particular version of the Logo language, the procedures we call
Logo primitives are primitive only in the sense of being in-built, part of
the implementation of the system. They are not primitives in the more normal sense
- i.e. non-derivative elements. In fact it is easy enough to define many
of the so-called primitives using just a small subset of the in-built procedures.
If it were not for speed and
efficiency, you would not need last since you can define it using
first, if, empty?, op, bf. With scarcely more resources, item
can also be defined
Try defining these two procedures - using
new names (e.g. new.last) for your versions of the primitives.
Notice that the procedures which you define will typically make use of recursion.
you similarly handle count, bl and
other primitives are derivative in this sense?
How small could a very
basic version of Logo be?
Department of Linguistic Science
The University of Reading