Contents

module PhoneNumber

open System

let private validate (input: string) =
    let isStartDigit digit = List.contains digit ['2'..'9']

    if isStartDigit input.[0] && isStartDigit input.[3] then
        Some input
    else 
        None

let clean (input: string) = 
    let digits = input.ToCharArray() |> Array.filter (Char.IsDigit) |> String

    match digits.Length with
    | 10 -> validate digits
    | 11 when digits.Chars 0 = '1' ->  validate (digits.Substring(1))
    | _ -> None

Version data entries

132 entries across 132 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.179	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.178	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.177	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.176	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.175	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.174	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.173	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.172	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.171	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.170	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.169	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.167	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.166	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.165	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.164	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.163	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.162	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.161	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.160	tracks/fsharp/exercises/phone-number/Example.fs