You can search for identifiers within the package.
in-package search v0.2.0
val take : int -> 'a list -> 'a list
val all_some : 'a option list -> 'a list option
val map : ('a -> 'b) -> 'a list -> 'b list
val mapi : (int -> 'a -> 'b) -> 'a list -> 'b list
val filter_map : ('a -> 'b option) -> 'a list -> 'b list
val find_map : ('a -> 'b option) -> 'a list -> 'b option
val fold_left : ('a -> 'b -> 'a) -> 'a -> 'b list -> 'a