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-2.2.1.139	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.138	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.137	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.136	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.135	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.134	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.133	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.132	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.131	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.130	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.129	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.128	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.127	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.126	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.125	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.124	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.123	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.122	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.121	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.120	tracks/fsharp/exercises/phone-number/Example.fs