luhn-generator/dist/luhn.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

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/* 0 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


module.exports = {
  checksum: function checksum(input) {
    var string = input.toString();
    var sum = 0;
    var parity = 2;

    for (var i = string.length - 1; i >= 0; i--) {
      var digit = Math.max(parity, 1) * string[i];

      sum += digit > 9 ? digit.toString().split('').map(Number).reduce(function (a, b) {
        return a + b;
      }, 0) : digit;
      parity *= -1;
    }

    sum %= 10;

    return sum > 0 ? 10 - sum : 0;
  },
  generate: function generate(input, inputOptions) {
    var string = input.toString();
    var options = { pad: 0, weightFactor: 2 };

    // option pad
    if (typeof inputOptions !== 'undefined') {
      if (typeof inputOptions.pad !== 'undefined') {
        options.pad = inputOptions.pad;

        if (options.pad > string.length) {
          string = Array(options.pad - String(string).length).join('0') + string;
        }
      }
    }

    return string + this.checksum(string);
  },
  random: function random(input, inputOptions) {
    function getRandomStringOfNumbers(length) {
      var randomStringOfNumbers = '';

      while (randomStringOfNumbers.length < length) {
        var random = Math.random().toString();

        randomStringOfNumbers += random.substr(2, random.length);

        if (randomStringOfNumbers.length > length) {
          randomStringOfNumbers = randomStringOfNumbers.substr(0, length);
        }
      }

      return randomStringOfNumbers;
    }

    return this.generate(getRandomStringOfNumbers(input - 1), inputOptions);
  },
  validate: function validate(input) {
    return this.checksum(input.toString().slice(0, -1)) === parseInt(input.toString().slice(-1));
  }
};

/***/ })
/******/ ]);
});