unique promo code generation

promoGen.es5.js

/**
 * takes email and returns unique id, may need .reduce polyfill for < ie8
 * 
 * @param {string} str - an email address (or any string) to convert to unqiue id
 * @returns {string} unique identifier
 */
 
function promoGen(str) {
  var data = str.split('').reduce(function (acc, s, i) {
    var code = s.codePointAt();
    acc.sum += code;
    acc.slope += code * i;
    return acc;
  }, { sum: 0, slope: 0 });
  return data.sum + '-' + data.slope + '-' + str.length;
}

promoGen.es6.js

const promoGen = (str) => {
  const data = str.split('').reduce((acc, s, i) => {
    const code = s.codePointAt();
    acc.sum += code;
    acc.slope += code * i;
    return acc;
  }, {sum: 0, slope: 0});
  return `${data.sum}-${data.slope}-${str.length}`;
};