F#：替换为 .Replace("oldValue","newValue")

Question

我正在尝试使用 F# 语法。

在瑞典，我们有一款游戏叫做 "Backslang" （googletranslated from "Rövarspråk"） 规则很简单。你说的所有话都必须以特定的方式说出来。虽然人声相同，但每个辅音必须用 "o" 后跟辅音再次发音。

I.e. "L" would be "LOL", "FRIDAY" would be "FOFRORIDODAY" and "BALL" would be "BOBALOLLOL".

我写了一些代码，看起来很愚蠢，但确实有效。

let myWord (x:string) = 
    x.Replace("q","qoq").Replace("w","wow").Replace("r","ror").Replace("t","tot").Replace("p","pop").Replace("s","sos").Replace("d","dod").Replace("f","fof").Replace("g","gog").Replace("h","hoh").Replace("j","joj").Replace("k","kok").Replace("l","lol").Replace("z","zoz").Replace("x","xox").Replace("c","coc").Replace("v","vov").Replace("b","bob").Replace("n","non").Replace("m","mom").Replace("Q","QOQ").Replace("W","WOW").Replace("R","ROR").Replace("T","TOT").Replace("P","POP").Replace("S","SOS").Replace("D","DOD").Replace("F","FOF").Replace("G","GOG").Replace("H","HOH").Replace("J","JOJ").Replace("K","KOK").Replace("L","LOL").Replace("Z","ZOZ").Replace("X","XOX").Replace("C","COC").Replace("V","VOV").Replace("B","Bob").Replace("N","Non").Replace("M","Mom").ToLower()   

    myWord "ball"

F# Interactive: val it : string = "bobalollol"

为了可读性，有没有办法让这段代码看起来更好看？

我是 F# 和函数式编程的新手，因此热烈欢迎任何建议、提示和指示！

Answer 1

也许是这样的：

let isVowel = function
  | 'a' | 'e' | 'i' | 'o' | 'u' | 'y' | 'å' | 'ä' | 'ö'
  | 'A' | 'E' | 'I' | 'O' | 'U' | 'Y' | 'Å' | 'Ä' | 'Ö' -> true
  | _ -> false

let lollify s =
  [| for c in s do if isVowel c then yield c else yield c; yield 'o';yield c |]
  |> System.String

[<EntryPoint>]
let main argv = 
  printfn "%A" <| lollify "Ball"
  0

注意；这也有不创建大量临时 string 对象的好处。

另一种选择是：

let lollify s =
  s
  |> Seq.map (fun c -> if isVowel c then [|c|] else [|c;'o';c|])
  |> Seq.collect id
  |> Seq.toArray
  |> System.String

Answer 2

String.collect (string >> function
    | vowel when "aeiouyåäöAEIOUYÅÄÖ".Contains vowel -> vowel
    | consonant -> consonant + "o" + consonant )

String.collect 对字符串的每个字符应用一个函数。

F#：替换为 .Replace("oldValue","newValue")

F#: Substitute to .Replace("oldValue","newValue")

replace

f#

char

substitution