18 Lists
This library is unstable;
compatibility will not be maintained.
See Unstable for more information.
True if l is a prefix of r.
The subsequent bindings were added by Sam Tobin-Hochstadt.
Extends
l2 to be as long as
l1 by adding
(- (length l1) (length l2)) copies of
v to the end of
l2.
Example: |
> (extend '(1 2 3) '(a) 'b) | '(a b b) |
|
The subsequent bindings were added by Ryan Culpepper.
Returns the first duplicate item in lst. More precisely, it
returns the first x such that there was a previous
y where (same? (extract-key x) (extract-key y)).
The same? argument can either be an equivalence predicate
such as equal? or eqv? or a dictionary. In the
latter case, the elements of the list are mapped to #t in the
dictionary until an element is discovered that is already mapped to a
true value. The procedures equal?, eqv?, and
eq? automatically use a dictionary for speed.
The subsequent bindings were added by Carl Eastlund.
Produces lists of the respective values of
f applied to the elements in
lst ... sequentially.
Produces a pair of lists of the respective values of
f applied to the
elements in
lst ... sequentially.
The subsequent bindings were added by David Van Horn.
Returns a list that is like lst, omitting the first element of lst
for which pred produces a true value.