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-2.2.1.78	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.77	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.76	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.75	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.74	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.73	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.72	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.71	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.70	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.69	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.68	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.67	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.66	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.65	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.64	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.63	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.62	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.61	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.60	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.59	tracks/fsharp/exercises/phone-number/Example.fs