keithlisp/doc/stdlib_data.md

Data Structures

These functions operate on various data structures in Keithlisp.

cons

(cons car cdr)

cons allocates and returns a new cons with the given car and cdr.

car

(car cons)

car returns the car portion of cons, or nil if the argument is not a cons.

cdr

(cdr cons)

cdr returns the cdr portion of cons, or nil if the argument is not a cons.

list

(list &rest elements)

list allocates and returns a new list containing elements.

length

(length list)

length returns the length of list, or nil if it is not a valid list. If list is circular, length may never return.

nth

(nth index list)

Returns the indexth element in list. index must be an int.

nthcdr

(nthcdr index list)

Returns the cdr of the indexth cons in list. index must be an int.