diff --git a/core/CCString.ml b/core/CCString.ml
index 2f5094f3..9c46b93c 100644
--- a/core/CCString.ml
+++ b/core/CCString.ml
@@ -41,10 +41,9 @@ module type S = sig
   (** {2 Conversions} *)
 
   val to_gen : t -> char gen
-
   val to_seq : t -> char sequence
-
   val to_klist : t -> char klist
+  val to_list : t -> char list
 
   val pp : Buffer.t -> t -> unit
 end
@@ -59,6 +58,10 @@ let hash s = Hashtbl.hash s
 
 let length = String.length
 
+let rec _to_list s acc i len =
+  if len=0 then List.rev acc
+  else _to_list s (s.[i]::acc) (i+1) (len-1)
+
 let _is_sub ~sub i s j ~len =
   let rec check k =
     if k = len
@@ -220,6 +223,26 @@ let of_klist l =
 
 let to_klist s = _to_klist s 0 (String.length s)
 
+let to_list s = _to_list s [] 0 (String.length s)
+
+let of_list l =
+  let s = String.make (List.length l) ' ' in
+  List.iteri (fun i c -> s.[i] <- c) l;
+  s
+
+(*$T
+  of_list ['a'; 'b'; 'c'] = "abc"
+  of_list [] = ""
+*)
+
+let of_array a =
+  let s = String.make (Array.length a) ' ' in
+  Array.iteri (fun i c -> s.[i] <- c) a;
+  s
+
+let to_array s =
+  Array.init (String.length s) (fun i -> s.[i])
+
 let pp buf s =
   Buffer.add_char buf '"';
   Buffer.add_string buf s;
@@ -252,6 +275,7 @@ module Sub = struct
   let to_seq (s,i,len) k =
     for i=i to i+len-1 do k s.[i] done
   let to_klist (s,i,len) = _to_klist s i len
+  let to_list (s,i,len) = _to_list s [] i len
 
   let pp buf (s,i,len) =
     Buffer.add_char buf '"';
diff --git a/core/CCString.mli b/core/CCString.mli
index 83e72342..19fbe9fc 100644
--- a/core/CCString.mli
+++ b/core/CCString.mli
@@ -45,10 +45,9 @@ module type S = sig
   (** {2 Conversions} *)
 
   val to_gen : t -> char gen
-
   val to_seq : t -> char sequence
-
   val to_klist : t -> char klist
+  val to_list : t -> char list
 
   val pp : Buffer.t -> t -> unit
 end
@@ -64,10 +63,12 @@ val compare : t -> t -> int
 val hash : t -> int
 
 val of_gen : char gen -> t
-
 val of_seq : char sequence -> t
-
 val of_klist : char klist -> t
+val of_list : char list -> t
+val of_array : char array -> t
+
+val to_array : t -> char array
 
 val find : ?start:int -> sub:t -> t -> int
 (** Find [sub] in the string, returns its first index or -1.
diff --git a/tests/helpers.ml b/tests/helpers.ml
index 2da169d1..76f66577 100644
--- a/tests/helpers.ml
+++ b/tests/helpers.ml
@@ -7,7 +7,6 @@ let print_int_list l =
   Buffer.contents b
 
 let print_int_int_list l =
-  let printer fmt (i,j) = Format.fprintf fmt "%d, %d" i j in
   let b = Buffer.create 20 in
   CCList.pp (CCPair.pp CCInt.pp CCInt.pp) b l;
   Buffer.contents b