Install

$ npm install --save mod10-check-digit
# OR
$ yarn add mod10-check-digit

Usage

Module exports a single function that takes a number string as argument and returns the check digit number.

const mod10CheckDigit = require('mod10-check-digit')

console.log(mod10CheckDigit('9202204720082')) // 2
console.log(mod10CheckDigit('7992739871')) // 3
console.log(mod10CheckDigit('7240157335352')) // 4

CLI

$ npm install --global mod10-check-digit
# OR
$ yarn global add mod10-check-digit

Then:

$ mod10-check-digit 9202204720082
# 2

Contribute

Contributions are welcome. Please open up an issue or create PR if you would like to help out.

Note: If editing the README, please conform to the standard-readme specification.

License

Licensed under the MIT License.