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include Stdlib.Array
let is_empty (arr: 'a array): bool =
length arr = 0
let first (arr: 'a array): 'a =
assert (not (is_empty arr));
get arr 0
let last (arr: 'a array): 'a =
let len = length arr in
assert (0 < len);
get arr (len - 1)
let find (p: 'a -> bool) (arr: 'a array): int =
let len = length arr
in
let rec find i =
if i = len || p (get arr i) then
len
else
find (i + 1)
in
find 0
let take (n:int) (arr:'a array): 'a array =
assert (n <= length arr);
sub arr 0 n
let remove_last (n: int) (arr: 'a array): 'a array =
let len = length arr in
assert (n <= len);
take (len - n) arr
let put (i:int) (a:'a) (arr:'a array): 'a array =
assert (i < length arr);
let res = copy arr in
set res i a;
res
let push (a:'a) (arr:'a array): 'a array =
let len = length arr in
init
(len + 1)
(fun i ->
if i < len then
get arr i
else
a)
let fill (n: int) (e: 'a) (arr: 'a array): 'a array =
let len = length arr in
let arr_new = make (len + n) e in
blit arr 0 arr_new 0 len;
arr_new