如何连接F#中的字符串列表? [英] How do I concatenate a list of strings in F#?

问题描述

此刻我正在尝试，但是我还没有弄清楚方法签名...有人吗? messages是seq [string]

I'm trying this at the moment, but I haven't quite got the method signature worked out... anyone? messages is a field of seq[string]

let messageString = List.reduce(messages, fun (m1, m2) -> m1 + m2 + Environment.NewLine)

推荐答案

不是您想要的东西，而是

Not exactly what you're looking for, but

let strings = [| "one"; "two"; "three" |]
let r = System.String.Concat(strings)
printfn "%s" r

你可以做

let strings = [ "one"; "two"; "three" ]
let r = strings |> List.fold (+) ""
printfn "%s" r

或

let strings = [ "one"; "two"; "three" ]
let r = strings |> List.fold (fun r s -> r + s + "\n") ""
printfn "%s" r

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