Module to calculate and validate check digits for redundancy checking, using f.ex. mod10 (luhn algorithm) or mod11.
npm install checkdigitcheckdigit
==========
Module to calculate and validate check digits for redundancy checking, using f.ex. mod10 (luhn algorithm) or mod11.
npm install checkdigit
``javascript
var checkdigit = require('checkdigit');
checkdigit.mod10.isValid('2345676') // true
checkdigit.mod10.create('234567') // '6'
checkdigit.mod10.apply('234567') // '2345676'
checkdigit.mod11.isValid('123456785') // true
checkdigit.mod11.create('12345678') // '5'
checkdigit.mod11.apply('12345678') // '123456785'
``
In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Run tests using npm test.