|
Primitives |
Arguments |
Use |
|
true |
none |
Returns "true. |
|
false |
none |
Returns "false. |
|
word? |
a |
Returns true if a is a word, false otherwise. |
|
number? |
a |
Returns true if a is a number, false otherwise. |
|
integer? |
a |
returns true if a is a whole number, false otherwise. |
|
list? |
a |
Returns true if a is a list, false otherwise. |
|
empty? |
a |
Returns true if a is an empty word or an empty list, false otherwise. |
|
equal? |
a b |
Returns true if a and b are equal, false otherwise. |
|
before? |
a b : words |
Returns true if a is before b in terms of alphabetical order, false otherwise. |
|
member? |
a b |
If b is a list, specifies if a is an element of b. If b is a word, specifies if a is a letter in b. |
|
member |
a b |
If b is a list, look for the element a in this list. There are two possible outcomes: |
|
|
|
-If a is in b, returns a sublist containing all list elements from the first instance of a in b. |
|
|
|
-If a is not in b, returns the word false. |
|
|
|
If b is a word, look for the character a in this word. There are two possibilities: |
|
|
|
- If a is in b, return the latter part of the word, starting from
a. |
|
|
|
-Otherwise, return the word false. |
|
|
|
member ``o ``cocoa return ocoa |
|
|
|
member 3 [1 2 3 4] returns [3 4] |
|
pd?, pendown? |
anything |
Returns the word true is the pen is down, false otherwise. |
|
visible? |
anything |
Returns the word true if the turtle is visible, false otherwise. |
|
prim?, primitive? |
a: word |
Returns true if the word is an XLOGO primitive, false otherwise. |
|
proc?, procedure? |
a: word |
Returns true if the word is a procedure defined by the user, false otherwise. |
|
var? variable? |
a: word |
Return true if :a is a variable, false otherwise. |
