Sort arrays by key- Javascript

compare-to-sort-array.js

//https://www.sitepoint.com/sort-an-array-of-objects-in-javascript/

compare(a, b) {
    const genreA = a.servicebillingfact.rec_version_num;
    const genreB = b.servicebillingfact.rec_version_num;
    let comparison = 0;
    if (genreA < genreB) {
      comparison = 1;
    } else if (genreA > genreB) {
      comparison = -1;
    }
    return comparison;
}

compareValues(key, order) {
  return function (a, b) {
    if (!a.hasOwnProperty(key) ||
      !b.hasOwnProperty(key)) {
      return 0;
    }

    const varA = (typeof a[key] === 'string') ?
      a[key].toUpperCase() : a[key];
    const varB = (typeof b[key] === 'string') ?
      b[key].toUpperCase() : b[key];

    let comparison = 0;
    if (varA > varB) {
      comparison = 1;
    } else if (varA < varB) {
      comparison = -1;
    }
    return (
      (order === 'desc') ?
        (comparison * -1) : comparison
    );
  };
}