luhn-generator/update/node_modules/es-abstract/2017/WeekDay.js

A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

'use strict';

var mod = require('../helpers/mod');

var Day = require('./Day');

// https://ecma-international.org/ecma-262/5.1/#sec-15.9.1.6

module.exports = function WeekDay(t) {
	return mod(Day(t) + 4, 7);
};