<script>
  const companies = [
        {name: "Company One", category: "Finance", start: 1981, end: 2012},
        {name: "Company Two", category: "Retail", start: 1992, end: 2016},
        {name: "Company Three", category: "Auto", start: 1999, end: 2013},
        {name: "Company Four", category: "Technology", start: 1989, end: 2008},
        {name: "Company Five", category: "Finance", start: 2007, end: 2001},
        {name: "Company Six", category: "Auto", start: 1997, end: 2005},
        {name: "Company Seven", category: "Technology", start: 1987, end: 2003},
        {name: "Company Eight", category: "Retail", start: 1989, end: 2009},
        {name: "Company Nine", category: "Food", start: 1911, end: 2010}
    ]

  const ages = [33, 25, 12, 20, 17, 34, 56, 87, 63, 8, 73];

  // sort() old method
  const sortCompanies = companies.sort(function (a, b) {
      if (a.start > b.start) {
         return 1;
      } else {
         return -1;
      }
  });

  // sort() with fat arrows
  const sortCompanies = companies.sort((a, b) => {
      return (a.start > b.start)
  });

  const sortCompany = companies.sort((a, b) => (a.start > b.start));

  const sortAges = ages.sort((a, b) => (a - b));

  console.log(sortCompanies);
  console.log(sortCompany);
  console.log(sortAges);

  // same output for sortCompanies and sortCompany
  {name: "Company Nine", category: "Food", start: 1911, end: 2010}
  {name: "Company One", category: "Finance", start: 1981, end: 2012}
  {name: "Company Seven", category: "Technology", start: 1987, end: 2003}
  {name: "Company Four", category: "Technology", start: 1989, end: 2008}
  {name: "Company Eight", category: "Retail", start: 1989, end: 2009}
  {name: "Company Two", category: "Retail", start: 1992, end: 2016}
  {name: "Company Six", category: "Auto", start: 1997, end: 2005}
  {name: "Company Three", category: "Auto", start: 1999, end: 2013}
  {name: "Company Five", category: "Finance", start: 2007, end: 2001}

  // sortAges
  [8, 12, 17, 20, 25, 33, 34, 56, 63, 73, 87]

</script>