🚀 go-pugleaf

This is another part of the stuff I wrote for the British Logo User
Group.  (What a pity there isn't a Scottish Logo User Group -- its
members could have abbreviated its name to SLUG.)

I can't reproduce italics in this posting; sorry. 

This is posting 2 of 2

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Glossary

These are terms commonly used between Logo programmers.
Sometimes the same words have a slightly different
meaning in the computing community generally.  For a
general guide to computing terminology read: Galland F
J, Dictionary of computing.  Wiley, 1982.  For a
hilarious introduction to hackers' slang try: Steele G
L, Woods D R et al: The Hacker's dictionary, a guide to
the world of computer wizards.  New York: Harper and
Row, 1983.

Words in italics are cross-references.


absolute graphics: drawing pictures by giving cartesian
co-ordinates instead of turtle commands

button box: a highly simplified keyboard intended for
small children, usually driving a floor turtle or a
music box

control Logo: a version of Logo intended for use
controlling models or devices

data base: a facility for storing facts prior to
reasoning about them, accessed by putprop and getprop
or by assert and deny

data object: a number, word or list

dynaturtle: a turtle which has mass, intertia and
velocity, and is propelled by applying forces to it

editor: the Logo utility which allows you to define or
alter procedures

empty list: the list [ ] which contains no elements

empty word: the word " or ' which contains no
characters

expression: a combination of procedures, primitives and
data objects which can be evaluated to a single data
object

extension: routine written in machine code which can be
incorporated into Logo with use or bload, then called
as a primitive

fence: notional boundary to the screen area, which the
turtle may be unable to cross

floor turtle: a wheeled robot which draws on the floor

global variable: variable created by a make statement,
which persists (cf local variable)

greedy primitive: a primitive which accepts a variable
number of inputs

heading: direction in which the turtle is facing.
Usually expressed in degrees clockwise from north.

infix: appearing between the two expressions to which
it applies, e. g.  the + in 2 + 3

inputs: the values on which a procedure is to operate,
or their names.

intervene: to offer hints or advice to students

LCSI Logo: the syntax and semantics of the dialect of
Logo implemented by LCSI on various computers

list: ordered collection of zero or more words, numbers
and lists, bound between square brackets [ and ]

local variable: variable created as an input to a
procedure, or by a local statemement, which exists only
while the procedure that created it is running

microworld: collection of programs that allow
exploration in a particular subject area

music box: musical instrument which can be played by
giving Logo commands

predicate: a procedure which performs a test and
returns true or false, e. g.  = , greaterq

prefix: appearing before the expressions to which it
applies, e. g.  the add in add 2 3

primitive: a command built into the Logo system

procedure: a collection of Logo commands (c.f. editor)

program: collection of procedures which does something
interesting

property list: information about an object stored in
the data base

recursive: invoking itself.

screen turtle: a turtle which appears on the computer
display screen and mimics the movement of a floor
turtle

sprite: a notional animal which has shape, colour,
speed and direction, used in animated graphics

three dimensional Logo: a Logo version in which the
turtle inhabits a notional three-dimensional space,
instead of the usual flat plane.

title line: the first line of a procedure, which states
its name and the names of its inputs

toucan: notional animal that lives on a piano-like
keyboard and can move to and fro or peck, giving a
musical note

turtle: notional animal that has position and heading.
(c.f. screen turtle, floor turtle)

word: collection of zero or more letters and digits
prefixed with quote marks.


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