ocaml-standard-library/lib/string.mli

(** Concatenates two strings together in the provided order. *)
val ( + ) : string -> string -> string

(** Calculates the length of the provided string. *)
val length : string -> int

(** Converts an int to a string. *)
val of_int : int -> string

(** Converts a float to a string. *)
val of_float : float -> string

(** Converts a boolean to a string. *)
val of_bool : bool -> string