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-2.2.1.98	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.97	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.96	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.95	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.94	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.93	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.92	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.91	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.90	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.89	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.88	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.87	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.86	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.85	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.84	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.83	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.82	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.81	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.80	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.79	tracks/fsharp/exercises/phone-number/Example.fs