primait / elm-iban

Elm library that validates IBANs

Iban Validator

This small library started out as a module for an IBAN form validator.

Now it can parse a string to an IBAN object, that contains the Country, the CheckCode and the BBAN.

Actually CheckCode and BBAN are aliases for Strings.

Parse an IBAN

> import IBAN
> IBAN.fromString "BE68539007547034"
Ok (IBAN Belgium "68" "539007547034")
    : Result.Result IBAN.Types.Error IBAN.Types.IBAN

the fromString function performs validation as well, it checks the the IBAN length, according to the country code, and performs the sanity check pass (see https://en.wikipedia.org/wiki/International_Bank_Account_Number#Validating_the_IBAN)

Errors

the fromString function returns a Result Error IBAN, where Error can be

1. invalid iban length according to the country
2. the string contains invalid charactes
3. the sanity check failed
4. the country code is unknown

Show an IBAN

The library converts back the IBAN code in 2 string representations:

1. textual, it is expressed in groups of four characters separated by a single space
2. electronic without spaces

> import IBAN
> import IBAN.Types exposing (..)
> IBAN.toString Textual (IBAN Belgium "68" "539007547034")
"BE68 5390 0754 7034" : String
>
> IBAN.toString Electronic (IBAN Belgium "68" "539007547034")
"BE68539007547034" : String

Test

to run the tests

$ elm test