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Implement concatWith #10

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Implement concatWith #10

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5 changes: 5 additions & 0 deletions src/basis/__string.sml
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Original file line number Diff line number Diff line change
Expand Up @@ -136,6 +136,11 @@ structure String : STRING =

(* basis concat is aka old style implode *)

fun concatWith _ [] = ""
| concatWith _ [s] = s
| concatWith sep (s :: ss) =
concat (rev (foldl (fn (s, ss) => s :: sep :: ss) [s] ss))

fun compare (x:string,y) =
if x<y then LESS else if x>y then GREATER else EQUAL

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1 change: 1 addition & 0 deletions src/basis/string.sml
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Expand Up @@ -81,6 +81,7 @@ signature STRING =
val sub : (string * int) -> char
val extract : (string * int * int option) -> string
val concat : string list -> string
val concatWith : string -> string list -> string
val ^ : string * string -> string
val implode : char list -> string
val explode : string -> char list
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