8.16.0.4
9 Lists
| (require scramble/list) | package: scramble-lib |
procedure
(singleton? v) → boolean?
v : any/c
Returns #t if v is a list of length 1; #f otherwise.
Equivalent to (and (pair? v) (null? (cdr v))).
Examples:
> (singleton? (list 'hello)) #t
> (singleton? (list 1 2 3)) #f
> (singleton? (shared ([whys (cons 'why whys)]) whys)) #f
procedure
(append-reverse xs ys) → list?
xs : list? ys : list?
Example:
> (append-reverse '(1 2 3) '(a b c)) '(3 2 1 a b c)
Added in version 0.4 of package scramble-lib.