boolean

~

Takes:   number | number

Returns:   boolean

Approximate. Similar to round (number) = round (number) – returns true if the rounded inputs are equal. Similar to approximate

show 5.4 ~ 4.7
TRUE

afterp

Takes:   word1 | word2

Returns:   boolean

afterp outputs true if word1 comes after word2. To make the comparison, Logo uses the ASCII codes of the characters in the words. Note that all uppercase letters come before all lowercase letters. See beforep

show afterp "bread "apple
TRUE

approximatep

Takes:   number | number

Returns:   boolean

Returns true if the rounded value of the first number is the same as the rounded value of the second number. Similar to ~. See round

show approximatep 5.4 4.8
TRUE

archonp

Takes:   none

Returns:   boolean

Returns true if the archon (or main thread, used by the console) is executing.

show archonp

arrowp

Takes:   none

Returns:   boolean

Returns true if the directional arrow is enabled. See showarrow, hidearrow

show arrowp

attenuatep

Takes:   none

Returns:   boolean

Returns true if the calling turtle is currently attenuating its sound.

show attenuatep

audiowaitp

Takes:   none

Returns:   boolean

Returns true if autowait is set on. See audiowait

show audiowaitp

baleactivep

Takes:   name (word)

Returns:   boolean

Returns true if the bale of the specified name is currently active or running.

show baleactivep "bale

baleindexp

Takes:   bale (word) | index (number)

Returns:   boolean

Returns true if the turtle of the given index inside the given bale exists / is active. See newbale, baleindex

show baleindexp "bale 5

balep

Takes:   name (word)

Returns:   boolean

Returns true if the given bale name exists. See newbale

show balep "bale

balepausedp

Takes:   name (word)

Returns:   boolean

Returns true if the bale of the given name is currently paused. See pausebale, resumebale

show balepausedp

balesyncp

Takes:   bale (word)

Returns:   boolean

Returns true if the given bale is syncing. See balesync

show balesyncp "mybale

beforep

Takes:   word1 | word2

Returns:   boolean

beforep outputs true if word1 comes before word2. To make the comparison, Logo uses the ASCII codes of the characters in the words. Note that all uppercase letters come before all lowercase letters. See afterp

show beforep "bread "apple
FALSE

blocksp

Takes:   none

Returns:   boolean

Returns true if blocks mode is enabled.

show blocksp

buttonp

Takes:   button (number)

Returns:   boolean

Returns true if the specified button is pressed. 0 is the left mouse button or joypad button 0, 1 is the right mouse button or joypad button 1, 2 is both buttons, 3 is zoom in and 4 is zoom out.

show buttonp 0

camcontrolp

Takes:   none

Returns:   boolean

Returns true if camcontrol is enabled.

show camcontrolp

caseinsensitivep

Takes:   none

Returns:   boolean

Returns true if nocaseinsensitive is enabled.

show caseinsensitivep

collisionp

Takes:   turtle (word) | distance (number)

Returns:   boolean

Returns true if the specified turtle is within the specified distance of the calling turtle. See distance

show collisionp snappy 200
TRUE

consonantp

Takes:   word

Returns:   boolean

Returns true if the first letter of the supplied word is a consonant. Y is considered a vowel. See vowelp

show consonantp "x
TRUE

containsp

Takes:   word number or list | list

Returns:   boolean

Returns true if the specified word or number exists as an item in the specified list. See contains

show containsp "frog [pig duck frog]
true
show containsp 1 [1 2 3 4 5]

databasep

Takes:   databasename (word)

Returns:   boolean

Returns true if the given databasename is a defined database. See newdatabase

show databasep "mydb

debugp

Takes:   none

Returns:   boolean

Returns true if debug is enabled.

show debugp

definedp

Takes:   procedurename (word)

Returns:   boolean

Returns TRUE if the provided procedurename is the name of a defined procedure.

show definedp "myprocedure
TRUE

dictionaryp

Takes:   dictionary (word)

Returns:   boolean

Returns true if the specified dictionary is currently defined. See dictionary, newdictionary

show dictionaryp "mydict

divisorp divp

Takes:   numerator (number) | denominator (number)

Returns:   boolean

returns true of the numerator divides evenly into the denominator. See remainder,

show divisorp 5 20
true

dotp

Takes:   [x y (z)] (list)

Returns:   none

Returns true if there is a dot at the specified co-ordinates. Dots are turtle-specific, and so dotp will only detect the calling turtle’s dots.

show dotp [10 20 30]

dragselectp

Takes:   none

Returns:   boolean

Returns true if dragselect is enabled

dribblep

Takes:   none

Returns:   boolean

Returns true if turtleSpaces is currently dribbling. See dribble

elevationsnapp

Takes:   none

Returns:   boolean

Returns true if the calling turtle has elevationsnap enabled.

show elevationsnapp

eofp

Takes:   none

Returns:   boolean

Returns true if the current reader is at the end of the file. See reader, writer

show eofp

equalp

Takes:   expression | expression

Returns:   boolean

Returns true if both supplied expressions are equal

show equalp 5 5
TRUE

show equalp 3 5
FALSE

escapep

Takes:   none

Returns:   boolean

Returns true if escape is enabled

show escape

evenp

Takes:   number

Returns:   boolean

Returns true if the provided number is even (0, 2, 4, 6…)

show evenp 6

false

Takes:   none

Returns:   zero

Returns zero (false).

show false

fencep

Takes:   none

Returns:   boolean

Returns true if the calling turtle is in fence mode. See fence

show fencep

filep

Takes:   word

Returns:   boolean

Returns true if the file specified by the given word exists.

show filep "myfile

fluidp

Takes:   none

Returns:   boolean

Returns true if fluid is enabled in the calling turtle

show fluidp

followp

Takes:   none

Returns:   boolean

Returns true if the calling turtle is following another turtle

show followp

frozenp

Takes:   word

Returns:   boolean

Returns true if a frozen track with the name of the given word exists.

show frozenp "myfrozentrack

gamebuttonp

Takes:   buttom

Returns:   boolean

Returns true if the specified gamepad button is currently pressed.

show gamebuttonp

gradientp

Takes:   none

Returns:   boolean

Returns true if gradient is enabled

show gradientp

greaterequalp

Takes:   expression | expression

Returns:   boolean

Returns true if the first expression is greater than or equal to the second expression.

show greaterequalp 5 3
TRUE

show greaterequalp 3 3
TRUE

greaterp

Takes:   expression | expression

Returns:   boolean

Returns true if the first expression is greater than the second expression.

show greaterp 5 3
TRUE

show greaterp 3 5
FALSE

hatchlingp

Takes:   turtlename (word)

Returns:   boolean

Returns true if the given turtlename is a hatchling.

show hatchlingp "seymour
FALSE

imagep

Takes:   imagename (word)

Returns:   boolean

Returns true if the specified imagename is defined.

show imagep "image

insidep

Takes:   [x y z] [[x1 y1 z1] [x2 y2 z2]]

Returns:   boolean

Returns true if the first set of three-dimensional co-ordinates is within the cube created between the second and third sets of coordinates.

show insidep [0 0 0] [[-10 -10 -10] [10 10 10]]
true

keyclickp

Takes:   none

Returns:   boolean

Returns true if keyclick is enabled. See keyclick

show keyclickp

keyp

Takes:   none

Returns:   boolean

Returns true if there are currently any keys in the keyboard buffer. Often seen with readchar, which will wait for a keypress if there are no keys in the buffer, to mitigate that behaviour. See readchar

show keyp

lessequalp

Takes:   expression | expression

Returns:   boolean

Returns true if the first expression is less than or equal to the second expression.

show lessequalp 3 5
TRUE

show lessequalp 3 3
TRUE

lessp

Takes:   expression | expression

Returns:   boolean

Returns true if the first expression is less than the second expression.

show lessp 3 5
TRUE

show lessp 5 3
FALSE

listp

Takes:   item

Returns:   boolean

Returns true if the provided item is a list.

show listp [frog pig]
TRUE

lockelevationp

Takes:   none

Returns:   boolean

Returns true if the calling turtle has lockelevation enabled.

show lockelevationp

longwordp

Takes:   word, longword or list

Returns:   boolean

Returns true if the provided input is a long word (a word that contains spaces).

show longwordp |I am a duck|

marcop

Takes:   none

Returns:   boolean

Returns true if the calling turtle has any current marcos attributed to it. If a turtle is expecting a marco, it can simply wait until marcop is true. See marco

show marcop

memberp

Takes:   word or list

Returns:   word or list

Returns true if the result of calling member using similar parameters is not empty.

show memberp "duck [pig duck frog]
true

mimicp

Takes:   none

Returns:   boolean

Returns true if the calling turtle is mimicking another turtle. See mimic

show mimicp

missilep

Takes:   id (word)

Returns:   boolean

Returns true if a missile of the given id exists / is active. See newmissile

show missilep "id

musicp

Takes:   musicname (word)

Returns:   boolean

Returns true if the specified music name is loaded in memory.

show musicp "mymusic

namep

Takes:   container (word)

Returns:   boolean

Returns true if the specified container exists.

show namep "container

nearmissilep

Takes:   class (word) | distance (turtle-units)

Returns:   boolean

Returns true if a missile of the given class exists within the given distance of the calling turtle. See newmissile

show nearmissilep "missile 20

nearp

Takes:   distance

Returns:   boolean

Returns true if there are any (nostealth) turtles in the given distance from the calling turtle.

show nearp 200
TRUE

not

Takes:   boolean

Returns:   boolean

Reverses an input boolean, an expression that resolves to either true or false

print not 5 = 4
TRUE

notesp

Takes:   none

Returns:   boolean

Returns true if the playnotes primitive is currently playing.

show notesp

numberp

Takes:   word

Returns:   boolean

Returns true if the supplied input is a number.

show numberp 15
TRUE

show numberp "dog
FALSE

oddp

Takes:   number

Returns:   boolean

Returns true if the provided number is odd (1, 3, 5, 7…)

show oddp 6

onp

Takes:   name (word)

Returns:   boolean

Returns true if a trigger of the given name is defined in the calling turtle. See on

show onp "trigger
TRUE

osdp

Takes:   none

Returns:   boolean

Returns true if the OSD is currently on. See osd

show osdp

overlayp

Takes:   name (word)

Returns:   boolean

Returns true if the specified overlay exists. See newoverlay

show overlayp "overlay

paperp

Takes:   none

Returns:   boolean

Returns true if paper mode is enabled. See paper

show paperp

playmusicp

Takes:   none

Returns:   boolean

Returns true if music is currently playing.

show playmusicp

procp

Takes:   name (word)

Returns:   boolean

Returns true if the calling turtle has a procedure with the provided name.

show procp "procedure

renderp

Takes:   none

Returns:   boolean

Returns true if rendering is enabled. See render.

searchp

Takes:   searchmask (word) | list

Returns:   boolean

Returns true if the specified search would return a result. See search

show searchp "pig [pig frog duck]
TRUE

sharep

Takes:   “sharename

Returns:   boolean

Returns true if the specified “sharename exists.

show sharep "sharename

shownp

Takes:   none

Returns:   boolean

Returns true if the turtle is not hidden, false if it is.

show shownp
TRUE

sleepoverp

Takes:   nonbe

Returns:   boolean

Returns true if the time taken between occurrences of a sleep command provided with a single-item list parameter, eg sleep [50] has exceeded that provided value. See sleepover

show sleepoverp

soundp

Takes:   soundname (word)

Returns:   boolean

Returns true if the specified sound is loaded in memory.

show soundp "mysound

spacep

Takes:   word

Returns:   boolean

Returns true if the specified space is defined.

show spacep "home
true

specklep

Takes:   none

Returns:   boolean

Returns true if speckle is enabled. See speckle

show specklep

stealthp

Takes:   none

Returns:   boolean

Returns true if the calling turtle is in stealth. See stealth, nostealth

show stealthp

stickerp

Takes:   none

Returns:   boolean

Returns true if the specified sticker is defined. See newsticker

show stickerp

stlbackingp

Takes:   none

Returns:   boolean

Returns true if stlbacking is enabled, otherwise false. See stlbacking, nostlbacking

show stlbackingp

suspendp

Takes:   workerid

Returns:   boolean

Returns true if the specified worker is suspended. See suspend, resume

show suspendp 12

syncp

Takes:   none

Returns:   boolean

Returns true if the calling turtle’s ‘family’ currently has an active sync. See sync

if syncp [sync]

tablep

Takes:   name (word)

Returns:   boolean

Returns true if the named table is defined.

show tablep "mytable

tagp

Takes:   tagname (word)

Returns:   boolean

Returns true if the provided tag name is presently defined. See tag

show tagp "tag

tagshownp

Takes:   tagname (word)

Returns:   boolean

Returns true if the tag with the provided tagname is currently visible (shown). See tag

show tagshownp "tag

tandemp

Takes:   none

Returns:   boolean

Returns true if the calling turtle is tandeming another turtle. See tandem

show tandemp

targetp

Takes:   none

Returns:   boolean

Returns true if the calling turtle is targeting another turtle. See target

show targetp

tetherp

Takes:   none

Returns:   boolean

Returns true if the calling turtle is tethering. See tether

show tetherp

trackp

Takes:   none

Returns:   boolean

Returns true if the calling turtle’s track is being generated / recorded. See track, notrack.

show trackp

trackrenderp

Takes:   none

Returns:   boolean

Returns true if the calling turtle’s track is being rendered.

show trackrenderp

transcriptp

Takes:   none

Returns:   boolean

Returns true if transcript is enabled. See transcript, notranscript

true

Takes:   none

Returns:   true

Returns true. See false

show true

turtlep

Takes:   turtle (word)

Returns:   boolean

Returns true if the named turtle exists.

show turtlep "myrtle

userp

Takes:   name (word)

Returns:   boolean

Returns true if the provided name is a currently defined user.

show userp "Bonnie
true

viewturtlep

Takes:   name (word)

Returns:   boolean

Returns true if the named turtle is currently the view turtle.

show viewturtlep "snappy
true

visiblep

Takes:   none

Returns:   boolean

Returns true if the calling turtle is in view of the current view turtle

show visiblep

vowelp

Takes:   character

Returns:   boolean

Returns true if the provided character is a vowel (a e i o u or y)

show vowelp "u

windowp

Takes:   none

Returns:   boolean

Returns true if the turtle is currently in ‘window’ mode. See window

show windowp

withinp

Takes:   number or list | number or list | number of list

Returns:   boolean

Compares two lists or numbers, returns true if they are within the variance specified by the third list of container. All three lists need to have the same number of parameters. Used mainly for comparing position / proximity of turtles.

show withinp [10 10 10] [15 15 15] [10 10 10]
true

show withinp 5 8 2
false

wrapp

Takes:   none

Returns:   boolean

Returns true if the turtle is currently in ‘wrap’ mode. See wrap, window, fence

show wrapp

wordp

Takes:   none

Returns:   boolean

Returns true if the input is a word.

show wordp "word