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Editorial Team
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Asked: 2026-05-13T20:42:09+00:00

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

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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?

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1 Answer

  1. Editorial Team

    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"
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