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-2.2.1.119	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.118	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.117	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.116	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.115	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.114	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.113	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.111	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.110	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.109	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.108	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.107	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.106	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.105	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.104	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.103	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.102	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.101	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.100	tracks/fsharp/exercises/phone-number/Example.fs
trackler-2.2.1.99	tracks/fsharp/exercises/phone-number/Example.fs