package ocaml-webworker
Legend:
Library
Module
Module type
Parameter
Class
Class type
include module type of struct include ListLabels end
val length : 'a list -> int

Return the length (number of elements) of the given list.

val hd : 'a list -> 'a

Return the first element of the given list. Raise Failure "hd" if the list is empty.

val tl : 'a list -> 'a list

Return the given list without its first element. Raise Failure "tl" if the list is empty.

val nth : 'a list -> int -> 'a

Return the n-th element of the given list. The first element (head of the list) is at position 0. Raise Failure "nth" if the list is too short. Raise Invalid_argument "List.nth" if n is negative.

val rev : 'a list -> 'a list

List reversal.

val append : 'a list -> 'a list -> 'a list

Catenate two lists. Same function as the infix operator @. Not tail-recursive (length of the first argument). The @ operator is not tail-recursive either.

val rev_append : 'a list -> 'a list -> 'a list

ListLabels.rev_append l1 l2 reverses l1 and concatenates it to l2. This is equivalent to ListLabels.rev l1 @ l2, but rev_append is tail-recursive and more efficient.

val concat : 'a list list -> 'a list

Concatenate a list of lists. The elements of the argument are all concatenated together (in the same order) to give the result. Not tail-recursive (length of the argument + length of the longest sub-list).

val flatten : 'a list list -> 'a list

Same as concat. Not tail-recursive (length of the argument + length of the longest sub-list).

Iterators
val iter : f:('a -> unit) -> 'a list -> unit

ListLabels.iter f [a1; ...; an] applies function f in turn to a1; ...; an. It is equivalent to begin f a1; f a2; ...; f an; () end.

val iteri : f:(int -> 'a -> unit) -> 'a list -> unit

Same as ListLabels.iter, but the function is applied to the index of the element as first argument (counting from 0), and the element itself as second argument.

  • since 4.00.0
val map : f:('a -> 'b) -> 'a list -> 'b list

ListLabels.map f [a1; ...; an] applies function f to a1, ..., an, and builds the list [f a1; ...; f an] with the results returned by f. Not tail-recursive.

val mapi : f:(int -> 'a -> 'b) -> 'a list -> 'b list

Same as ListLabels.map, but the function is applied to the index of the element as first argument (counting from 0), and the element itself as second argument.

  • since 4.00.0
val rev_map : f:('a -> 'b) -> 'a list -> 'b list

ListLabels.rev_map f l gives the same result as ListLabels.rev (ListLabels.map f l), but is tail-recursive and more efficient.

val fold_left : f:('a -> 'b -> 'a) -> init:'a -> 'b list -> 'a

ListLabels.fold_left f a [b1; ...; bn] is f (... (f (f a b1) b2) ...) bn.

val fold_right : f:('a -> 'b -> 'b) -> 'a list -> init:'b -> 'b

ListLabels.fold_right f [a1; ...; an] b is f a1 (f a2 (... (f an b) ...)). Not tail-recursive.

Iterators on two lists
val iter2 : f:('a -> 'b -> unit) -> 'a list -> 'b list -> unit

ListLabels.iter2 f [a1; ...; an] [b1; ...; bn] calls in turn f a1 b1; ...; f an bn. Raise Invalid_argument if the two lists are determined to have different lengths.

val map2 : f:('a -> 'b -> 'c) -> 'a list -> 'b list -> 'c list

ListLabels.map2 f [a1; ...; an] [b1; ...; bn] is [f a1 b1; ...; f an bn]. Raise Invalid_argument if the two lists are determined to have different lengths. Not tail-recursive.

val rev_map2 : f:('a -> 'b -> 'c) -> 'a list -> 'b list -> 'c list

ListLabels.rev_map2 f l1 l2 gives the same result as ListLabels.rev (ListLabels.map2 f l1 l2), but is tail-recursive and more efficient.

val fold_left2 : f:('a -> 'b -> 'c -> 'a) -> init:'a -> 'b list -> 'c list -> 'a

ListLabels.fold_left2 f a [b1; ...; bn] [c1; ...; cn] is f (... (f (f a b1 c1) b2 c2) ...) bn cn. Raise Invalid_argument if the two lists are determined to have different lengths.

val fold_right2 : f:('a -> 'b -> 'c -> 'c) -> 'a list -> 'b list -> init:'c -> 'c

ListLabels.fold_right2 f [a1; ...; an] [b1; ...; bn] c is f a1 b1 (f a2 b2 (... (f an bn c) ...)). Raise Invalid_argument if the two lists are determined to have different lengths. Not tail-recursive.

List scanning
val for_all : f:('a -> bool) -> 'a list -> bool

for_all p [a1; ...; an] checks if all elements of the list satisfy the predicate p. That is, it returns (p a1) && (p a2) && ... && (p an).

val exists : f:('a -> bool) -> 'a list -> bool

exists p [a1; ...; an] checks if at least one element of the list satisfies the predicate p. That is, it returns (p a1) || (p a2) || ... || (p an).

val for_all2 : f:('a -> 'b -> bool) -> 'a list -> 'b list -> bool

Same as ListLabels.for_all, but for a two-argument predicate. Raise Invalid_argument if the two lists are determined to have different lengths.

val exists2 : f:('a -> 'b -> bool) -> 'a list -> 'b list -> bool

Same as ListLabels.exists, but for a two-argument predicate. Raise Invalid_argument if the two lists are determined to have different lengths.

val mem : 'a -> set:'a list -> bool

mem a l is true if and only if a is equal to an element of l.

val memq : 'a -> set:'a list -> bool

Same as ListLabels.mem, but uses physical equality instead of structural equality to compare list elements.

List searching
val find : f:('a -> bool) -> 'a list -> 'a

find p l returns the first element of the list l that satisfies the predicate p. Raise Not_found if there is no value that satisfies p in the list l.

val filter : f:('a -> bool) -> 'a list -> 'a list

filter p l returns all the elements of the list l that satisfy the predicate p. The order of the elements in the input list is preserved.

val find_all : f:('a -> bool) -> 'a list -> 'a list

find_all is another name for ListLabels.filter.

val partition : f:('a -> bool) -> 'a list -> 'a list * 'a list

partition p l returns a pair of lists (l1, l2), where l1 is the list of all the elements of l that satisfy the predicate p, and l2 is the list of all the elements of l that do not satisfy p. The order of the elements in the input list is preserved.

Association lists
val assoc : 'a -> ('a * 'b) list -> 'b

assoc a l returns the value associated with key a in the list of pairs l. That is, assoc a [ ...; (a,b); ...] = b if (a,b) is the leftmost binding of a in list l. Raise Not_found if there is no value associated with a in the list l.

val assq : 'a -> ('a * 'b) list -> 'b

Same as ListLabels.assoc, but uses physical equality instead of structural equality to compare keys.

val mem_assoc : 'a -> map:('a * 'b) list -> bool

Same as ListLabels.assoc, but simply return true if a binding exists, and false if no bindings exist for the given key.

val mem_assq : 'a -> map:('a * 'b) list -> bool

Same as ListLabels.mem_assoc, but uses physical equality instead of structural equality to compare keys.

val remove_assoc : 'a -> ('a * 'b) list -> ('a * 'b) list

remove_assoc a l returns the list of pairs l without the first pair with key a, if any. Not tail-recursive.

val remove_assq : 'a -> ('a * 'b) list -> ('a * 'b) list

Same as ListLabels.remove_assoc, but uses physical equality instead of structural equality to compare keys. Not tail-recursive.

Lists of pairs
val split : ('a * 'b) list -> 'a list * 'b list

Transform a list of pairs into a pair of lists: split [(a1,b1); ...; (an,bn)] is ([a1; ...; an], [b1; ...; bn]). Not tail-recursive.

val combine : 'a list -> 'b list -> ('a * 'b) list

Transform a pair of lists into a list of pairs: combine [a1; ...; an] [b1; ...; bn] is [(a1,b1); ...; (an,bn)]. Raise Invalid_argument if the two lists have different lengths. Not tail-recursive.

Sorting
val sort : cmp:('a -> 'a -> int) -> 'a list -> 'a list

Sort a list in increasing order according to a comparison function. The comparison function must return 0 if its arguments compare as equal, a positive integer if the first is greater, and a negative integer if the first is smaller (see Array.sort for a complete specification). For example, Pervasives.compare is a suitable comparison function. The resulting list is sorted in increasing order. ListLabels.sort is guaranteed to run in constant heap space (in addition to the size of the result list) and logarithmic stack space.

The current implementation uses Merge Sort. It runs in constant heap space and logarithmic stack space.

val stable_sort : cmp:('a -> 'a -> int) -> 'a list -> 'a list

Same as ListLabels.sort, but the sorting algorithm is guaranteed to be stable (i.e. elements that compare equal are kept in their original order) .

The current implementation uses Merge Sort. It runs in constant heap space and logarithmic stack space.

val fast_sort : cmp:('a -> 'a -> int) -> 'a list -> 'a list

Same as ListLabels.sort or ListLabels.stable_sort, whichever is faster on typical input.

val init : f:(int -> 'a) -> int -> 'a list
val index : f:('a -> bool) -> 'a list -> int
val find_some : f:('a -> bool) -> 'a list -> 'a option
val rev_scan_left : 'a list -> f:('a -> 'b -> 'a) -> 'b list -> init:'a -> 'a list
val scan_left : f:('a -> 'b -> 'a) -> 'b list -> init:'a -> 'a list
val rev_filter : f:('a -> bool) -> 'a list -> 'a list
val filter_map : f:('a -> 'b option) -> 'a list -> 'b list
val find_map : f:('a -> 'b option) -> 'a list -> 'b
val map_end : f:('a -> 'b) -> 'a list -> 'b list -> 'b list
val concat_map : f:('a -> 'b list) -> 'a list -> 'b list
val replicate : 'a -> int -> 'a list
val remove : ?phys:bool -> 'a -> 'a list -> 'a list
val remove_all : 'a -> 'a list -> 'a list
val same : f:('a -> 'b -> bool) -> 'a list -> 'b list -> bool
val length_lessthan : int -> 'a list -> int option
val filter_dup' : equiv:('a -> 'b) -> 'a list -> 'a list
val filter_dup : 'a list -> 'a list
val merge_cons : f:('a -> 'a -> 'a option) -> 'a list -> 'a list
val take_while : f:('a -> bool) -> 'a list -> 'a list
val drop_while : f:('a -> bool) -> 'a list -> 'a list
val take_n : int -> 'a list -> 'a list
val drop_n : int -> 'a list -> 'a list
val split_n : int -> 'a list -> 'a list * 'a list
val split3 : ('a * 'b * 'c) list -> 'a list * 'b list * 'c list
val unfold : f:('a -> 'a option) -> 'a -> 'a list
val rev_unfold : 'a list -> f:('a -> 'a option) -> 'a -> 'a list
val fold_n_map : f:('a -> 'b -> 'a * 'c) -> init:'a -> 'b list -> 'a * 'c list
module Lazy : sig ... end
val last : 'a list -> 'a option
val group_by : ('a -> 'a -> bool) -> 'a list -> 'a list list
val merge : cmp:('a -> 'a -> int) -> 'a list -> 'a list -> 'a list
val uniq : cmp:('a -> 'a -> int) -> 'a list -> 'a list
val sort_uniq : cmp:('a -> 'a -> int) -> 'a list -> 'a list
val print : (unit -> 'a -> string) -> unit -> 'a list -> string