Convert a list of characters (or array) to a string

Question

how does one convert from a list of characters to a string?

To put it another way, how do I reverse List.ofSeq "abcd"?

UPDATE: new System.String (List.ofSeq "abcd" |> List.toArray) |> printfn "%A" seems to work fine, with or without new, but List.ofSeq "abcd" |> List.toArray) |> new System.String |> printfn "%A" fails. Why?

Answer 1

I asked a similar question once before. It seems object constructors aren't composable so you can't pass them as a function.

List.ofSeq "abcd" |> List.toArray |> (fun s -> System.String s) |> printfn "%A" List.ofSeq "abcd" |> List.toArray |> (fun s -> new System.String(s)) |> printfn "%A" 

Update Constructors are first-class functions as of F# 4.0

List.ofSeq "abcd" |> List.toArray |> System.String |> printfn "%A"