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-2.2.1.159	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.158	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.157	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.156	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.155	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.154	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.153	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.152	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.151	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.150	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.149	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.148	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.147	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.146	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.145	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.144	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.143	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.142	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.141	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.140	tracks/fsharp/exercises/phone-number/Example.fs