cons
cons — constructs a cons cell.
Syntax
cons (car_exp, cdr_exp)
Arguments
- car_exp
Any Gamma or Lisp expression.
- cdr_exp
Any Gamma or Lisp expression.
Returns
A list whose car is car_exp and whose cdr is cdr_exp.
Description
This function constructs a list whose car and cdr are
car_exp and
cdr_exp respectively. This
construction is also known as a cons
cell. If the cdr_exp is
a list, this has the effect of increasing the list by one
member, that is, adding the car_exp
to the beginning of the cdr_exp.
Example
Gamma> a = list(2,3,4);
(2 3 4)
Gamma> b = 5;
5
Gamma> cons(b,a);
(5 2 3 4)
Gamma> cons(a,b);
((2 3 4) . 5)
Gamma> cons(5,nil);
(5)
Gamma>
