boolean
~
boolean
number | number
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
boolean
word1 | word2
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
boolean
number | number
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
arrowp
boolean
none
boolean
Returns true if the directional arrow is enabled. See showarrow, hidearrow
show arrowp
attenuatep
boolean
none
boolean
Returns true if the calling turtle is currently attenuating its sound.
show attenuatep
audiowaitp
boolean
none
boolean
Returns true if autowait is set on. See audiowait
show audiowaitp
beforep
boolean
word1 | word2
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
boolean
none
boolean
Returns true if blocks mode is enabled.
show blocksp
buttonp
boolean
button (number)
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
show buttonp 0
camcontrolp
boolean
none
boolean
Returns true if camcontrol is enabled.
show camcontrolp
caseinsensitivep
boolean
none
boolean
Returns true if nocaseinsensitive is enabled.
show caseinsensitivep
collisionp
boolean
turtle (word) | distance (number)
boolean
Returns true if the specified turtle is within the specified distance of the calling turtle. See distance
show collisionp snappy 200
TRUE
consonantp
boolean
word
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
boolean
word number or list | list
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
boolean
databasename (word)
boolean
Returns true if the given databasename is a defined database. See newdatabase
show databasep "mydb
debugp
boolean
none
boolean
Returns true if debug is enabled.
show debugp
definedp
boolean
procedurename (word)
boolean
Returns TRUE if the provided procedurename is the name of a defined procedure.
show definedp "myprocedure
TRUE
dictionaryp
boolean
dictionary (word)
boolean
Returns true if the specified dictionary is currently defined. See dictionary, newdictionary
show dictionaryp "mydict
divisorp divp
boolean
numerator (number) | denominator (number)
boolean
returns true of the numerator divides evenly into the denominator. See remainder,
show divisorp 5 20
true
dotp
boolean
[x y (z)] (list)
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
boolean
none
boolean
Returns true if dragselect is enabled
dribblep
boolean
none
boolean
Returns true if turtleSpaces is currently dribbling. See dribble
eofp
boolean
none
boolean
Returns true if the current reader is at the end of the file. See reader, writer
show eofp
equalp
boolean
expression | expression
boolean
Returns true if both supplied expressions are equal
show equalp 5 5
TRUE
show equalp 3 5
FALSE
escapep
boolean
none
boolean
Returns true if escape is enabled
show escape
evenp
boolean
number
boolean
Returns true if the provided number is even (0, 2, 4, 6…)
show evenp 6
false
boolean
none
zero
Returns zero (false).
show false
fencep
boolean
none
boolean
Returns true if the calling turtle is in fence mode. See fence
show fencep
filep
boolean
word
boolean
Returns true if the file specified by the given word exists.
show filep "myfile
fluidp
boolean
none
boolean
Returns true if fluid is enabled in the calling turtle
show fluidp
followp
boolean
none
boolean
Returns true if the calling turtle is following another turtle
show followp
gamebuttonp
boolean
buttom
boolean
Returns true if the specified gamepad button is currently pressed.
show gamebuttonp
gradientp
boolean
none
boolean
Returns true if gradient is enabled
show gradientp
greaterequalp
boolean
expression | expression
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
boolean
expression | expression
boolean
Returns true if the first expression is greater than the second expression.
show greaterp 5 3
TRUE
show greaterp 3 5
FALSE
hatchlingp
boolean
turtlename (word)
boolean
Returns true if the given turtlename is a hatchling.
show hatchlingp "seymour
FALSE
imagep
boolean
imagename (word)
boolean
Returns true if the specified imagename is defined.
show imagep "image
insidep
boolean
[x y z] [[x1 y1 z1] [x2 y2 z2]]
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
boolean
none
boolean
Returns true if keyclick is enabled. See keyclick
show keyclickp
keyp
boolean
none
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
boolean
expression | expression
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
boolean
expression | expression
boolean
Returns true if the first expression is less than the second expression.
show lessp 3 5
TRUE
show lessp 5 3
FALSE
listp
boolean
item
boolean
Returns true if the provided item is a list.
show listp [frog pig]
TRUE
longwordp
boolean
word, longword or list
boolean
Returns true if the provided input is a long word (a word that contains spaces).
show longwordp |I am a duck|
marcop
boolean
none
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
boolean
word or list
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
boolean
none
boolean
Returns true if the calling turtle is mimicking another turtle. See mimic
show mimicp
musicp
boolean
musicname (word)
boolean
Returns true if the specified music name is loaded in memory.
show musicp "mymusic
namep
boolean
container (word)
boolean
Returns true if the specified container exists.
show namep "container
nearp
boolean
distance
boolean
Returns true if there are any (nostealth) turtles in the given distance from the calling turtle.
show nearp 200
TRUE
not
boolean
boolean
boolean
Reverses an input boolean, an expression that resolves to either true or false
print not 5 = 4
TRUE
notesp
boolean
none
boolean
Returns true if the playnotes primitive is currently playing.
show notesp
numberp
boolean
word
boolean
Returns true if the supplied input is a number.
show numberp 15
TRUE
show numberp "dog
FALSE
oddp
boolean
number
boolean
Returns true if the provided number is odd (1, 3, 5, 7…)
show oddp 6
osdp
boolean
none
boolean
Returns true if the OSD is currently on. See osd
show osdp
overlayp
boolean
name (word)
boolean
Returns true if the specified overlay exists. See newoverlay
show overlayp "overlay
paperp
boolean
none
boolean
Returns true if paper mode is enabled. See paper
show paperp
playmusicp
boolean
none
boolean
Returns true if music is currently playing.
show playmusicp
procp
boolean
name (word)
boolean
Returns true if the calling turtle has a procedure with the provided name.
show procp "procedure
renderp
boolean
none
boolean
Returns true if rendering is enabled. See render.
searchp
boolean
searchmask (word) | list
boolean
Returns true if the specified search would return a result. See search
show searchp "pig [pig frog duck]
TRUE
sharep
boolean
“sharename
boolean
Returns true if the specified “sharename exists.
show sharep "sharename
shownp
boolean
none
boolean
Returns true if the turtle is not hidden, false if it is.
show shownp
TRUE
soundp
boolean
soundname (word)
boolean
Returns true if the specified sound is loaded in memory.
show soundp "mysound
spacep
boolean
word
boolean
Returns true if the specified space is defined.
show spacep "home
true
specklep
boolean
none
boolean
Returns true if speckle is enabled. See speckle
show specklep
stealthp
boolean
none
boolean
Returns true if the calling turtle is in stealth. See stealth, nostealth
show stealthp
stickerp
boolean
none
boolean
Returns true if the specified sticker is defined. See newsticker
show stickerp
stlbackingp
boolean
none
boolean
Returns true if stlbacking is enabled, otherwise false. See stlbacking, nostlbacking
show stlbackingp
suspendp
boolean
workerid
boolean
Returns true if the specified worker is suspended. See suspend, resume
show suspendp 12
syncp
boolean
none
boolean
Returns true if the calling turtle’s ‘family’ currently has an active sync. See sync
if syncp [sync]
tablep
boolean
name (word)
boolean
Returns true if the named table is defined.
show tablep "mytable
tagp
boolean
tagname (word)
boolean
Returns true if the provided tag name is presently defined. See tag
show tagp "tag
tagshownp
boolean
tagname (word)
boolean
Returns true if the tag with the provided tagname is currently visible (shown). See tag
show tagshownp "tag
tandemp
boolean
none
boolean
Returns true if the calling turtle is tandeming another turtle. See tandem
show tandemp
targetp
boolean
none
boolean
Returns true if the calling turtle is targeting another turtle. See target
show targetp
tetherp
boolean
none
boolean
Returns true if the calling turtle is tethering. See tether
show tetherp
trackp
boolean
none
boolean
Returns true if the calling turtle’s track is being generated / recorded. See track, notrack.
show trackp
trackrenderp
boolean
none
boolean
Returns true if the calling turtle’s track is being rendered.
show trackrenderp
transcriptp
boolean
none
boolean
Returns true if transcript is enabled. See transcript, notranscript
true
boolean
none
true
Returns true. See false
show true
userp
boolean
name (word)
boolean
Returns true if the provided name is a currently defined user.
show userp "Bonnie
true
viewturtlep
boolean
name (word)
boolean
Returns true if the named turtle is currently the view turtle.
show viewturtlep "snappy
true
visiblep
boolean
none
boolean
Returns true if the calling turtle is in view of the current view turtle
show visiblep
vowelp
boolean
character
boolean
Returns true if the provided character is a vowel (a e i o u or y)
show vowelp "u
windowp
boolean
none
boolean
Returns true if the turtle is currently in ‘window’ mode. See window
show windowp
withinp
boolean
number or list | number or list | number of list
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
boolean
none
boolean
Returns true if the turtle is currently in ‘wrap’ mode. See wrap, window, fence
show wrapp
wordp
boolean
none
boolean
Returns true if the input is a word.
show wordp "word