containers

:container

containers

none

A colon : indicates a container, with the name of the word following the colon. turtleSpaces ‘resolves’ a :container ‘tag’ into the value of that container when an instruction is executed, such that if the value of :container is 5, then forward :container becomes ‘resolved’ to forward 5, before the instruction is executed.

show :container

:=

containers

expression | expression

none

Assigns the value of the second expression to the container name resolved by the first expression. See make for more details

So, for example, "frog := 5 puts the value 5 in the container named frog. However, :frog := 5 puts the value of 5 in the container named whatever is inside the container named frog.

"frog := "duck
:frog = 5
show :duck
5

buryname

containers

name or [list]

none

Buries the provided container names.

buryname "container

dequeue

containers

container

item

Similar to pop, except removes the item from the end of the list. See pop

show dequeue "container

edn

containers

containername (word)

none

Inserts a make statement into the prompt containing the specified container name and its contents for editing.

edn "container

edns

containers

containername(s) (list)

none

Opens the editor with a list of the provided containers and their contents, which are updated when the editor is exited.

edns [container1 container2]

eraselocal

containers

container (word)

none

Erases the named local container. See local

erase "localcontainer

erasename ern

containers

container (word)

none

Erases the name off of a specified container (unallocating it), and empties its contents.

erasename "mycontainer

erasenames erns

containers

none

Erases the names off of all the containers held by the turtle that calls it, and empties their contents

erasenames

eraseprivate

containers

container (word)

none

Erases the named private container. See private

eraseprivate "privatecontainer

eraseshare

containers

container (word)

none

Erases the specified shared container.

eraseshare "sharedcontainer

eraseshares

containers

none

Erases all shared containers and their contents.

erprops

containers

none

Erases all property lists.

erprops

get

containers

surname | container

value

Returns the value of the specified container under the given surname. See setsurname, set

show get "jones "car
camry

gprop

containers

name | property

value

Returns the value of the property in the named property list. See plist

show gprop "john "phone

in

containers

anything

in simply passes whatever is passed to it. It is useful in two main contexts: first, to improve the readability of the make alternative put, as in put 5 in “container; second, to retrieve the value of another turtle’s container using query, as in query “myrtle [in :container].

pr query speedy [in :suspensions]

inc

containers

name (word)

none

Increments the contents of the named container by one. Has no effect if the value of the container is not a number.

show "container
4
inc "container
show "container
5

local

containers

word or list

none

Changes the scope of the container(s) specified by the supplied word or list to local – that is, they are only accessible by the current procedure, and only while it is executing. To preserve the state of the container when the procedure is not executing, use private. See make

local "container
local [container1 container2]

make

containers

name (word) | word, list, evaluated-list, expression or number

names (list) | list of words, numbers or lists

none

Make creates a container (also known as a container) with the name specified by the first parameter, containing the item(s) specified or generated by the second parameter. It also works with lists of both the former and the latter (see examples), but if you want to assign the returns from advisers you will need to use a softlist {}. See name and put

make "container 5
print container
5

make "container [dog pig cow]
show "container
[dog pig cow]

make [ducks frogs pigs] [4 3 1]
show :ducks
4
show :frogs
3

make [x y z] {xpos ypos zpos}

make!

containers

name (word) | expression

Contains a runtime-evaluated expression, or ‘mutated’ container. This allow expressions to be stored inside containers, and rather than being evaluated when stored, they are evaluated when recalled. A container that contains a REX may only contain a single REX and nothing else. See also name! and put!

make! “moo iterate (array 1 + random 10) [“moo]

pr :moo

make! "clock (se hours minutes seconds)
pr :clock

name

containers

number, word, longword, list, expression or container | name (word)

none

An alternative to make. Traditionally used for constants, eg name 3.14 “pi. See make, put

name 3.14 "pi

name!

containers

expression | name (word)

none

Creates a mutated container, one whose expression is re-evaluated whenever it is accessed. See make!

name! (se hours minutes seconds) "clock

names

containers

none

list

Returns a list of the defined containers (their names).

show names

plist

containers

propertylistname (word)

propertylist (list)

Outputs the property list associated with the supplied name. Any word can have a property list associated with it – a list of ‘properties’ and their values. plist returns a list of these pairs sequentially: [property1 value1 property2 value2 etc.] See pprop

show plist "propertylist

pon

containers

container(s) (word or list)

none

Prints out the name and value of the named container(s)

pon "container

pons

containers

none

Prints out the names and values of every container in the workspace.

pons

pop

containers

container

item

‘Pops’ the item at the front of the container and returns it, removing it from the contained word or list. Equivalent to: make “pop first :list make “list butfirst :list

See push

make "result pop "pushlist

pprop

containers

name | property | value

none

Property lists are a special type of container that hold multiple property / value pairs. You can have a property list and a non-property list container with the same name.

pprop "addresses [Marty McFly] [9303 Lyon Drive, Lyon Estates, Hill Valley CA 95420]

pps

containers

none

Prints the property list containers belonging to the calling turtle.

pps

private

containers

word

none

Initialises a private container with the name provided. A private container is a container which only exists and whose value persists inside of a procedure. This allows you to construct a procedure that modifies and stores internal parameters without losing them when that procedure exits, and needing to store them in the turtle. See the examples.

TO test
if not namep "frog [private "frog make "frog 1 stop]
inc "frog
show :frog
END

TO test :switch
private "var
if :switch = "a [make "var 1]
if :switch = "b [inc "var show :var]
END

put

containers

input (number, word, longword, list, primitive or container) | in | name (word)

none

Another syntax for make used by some Logos. ‘in’ is a simple prmitive that forwards whatever is passed to it. See in

put 5 in "counter

put!

containers

expression | in | name (word)

See make!

put! (se hours minutes seconds) in “clock

push

containers

item | container

none

“Pushes” the item on to the front of the specified container, making it the first item, and pushing the rest of the items to the right. If the container contains a word, push pushes the item on to the start of the word. If the container contains a list, push pushes the item on to the front of the list. To pull the item out of the container, use pop. Also see queue and dequeue (which do similar but to the end of the container).

push "frog "animals

queue

containers

item | container

none

Similar to push, except adds the provided item to the end of the container, appending it to the word or list inside it. See push

queue "item "container

remprop

containers

name | property

none

Removes the given property from the named property list.

remprop "proplist "property

rename

containers

oldname | newname

Renames a container.

rename “oldname “newname

set

containers

surname | container | value

none

Sets the contents of the named container in the named surname to the provided value. See setsurname, surname, get

set "jones "car "camry

setsurname

“surname

none

Used to select the ‘surname’, otherwise more commonly known as the ‘container space’, to use. All the containers (or variables) in turtleSpace have a surname, or family they belong to. Changing the surname allows you to use code containing single-dimension containers in different contexts (for example, different players) without having to modify it. You just set a different surname and run the code again. The default surname is “default

setsurname “player1

make "score 5
setsurname "player2
make "score 10
setsurname "player1
print :score
5

setvar

containers

turtle (word) | container (word) | value (word, number, list or boolean)

none

Changes the contents of the container held by the specified turtle to the specified value. Technically bad form, but sometimes necessary.

setvar "myrtle "container 50

“name

none

Indicates that the container “name should be shared amongst all turtles.

share “lives

surname

containers

none

namespace (word)

Returns the surname of the current container (name) space. The default surname is ‘default’. See setsurname.

print surname
default

swap

containers

container1 (word) | container2 (word)

none

Exchanges the contents of two containers. Note that the name of the container is specified as a word, eg “container. See make

swap "container1 "container2

thing

containers

containername (word)

output

Returns the contents of (the ‘thing’ in) the container of the provided container name. A longhand way of invoking the shortcut :container

show thing in "mycontainer
make "mycontainer thing in "mycontainer + 5

unburyname

containers

word or list

none

Unburies the container(s) named in its input. See bury

unburyname "container

unshare

containers

name (word) or names (list)

none

Unlike eraseshare which erases the share and its container, unshare changes the share back into a ‘global’ (turtle-internal) container.

unshare "container

Containers

containers