<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];

  // map()
  const testMap = companies.map(function(company) {
      return company.name;
  });

  // map() using fat arrows
  const ageMap1 = ages.map((age) => { return Math.sqrt(age) });
  const ageMap2 = ages.map((age) => Math.sqrt(age));

  console.log(testMap);
  console.log(ageMap1);
  console.log(ageMap2);

  // testMap
  ["Company One", "Company Two", "Company Three", "Company Four", "Company Five", "Company Six", "Company Seven", "Company Eight", "Company Nine"]

  // ageMap1
  [5.744562646538029, 5, 3.4641016151377544, 4.47213595499958, 4.123105625617661, 5.830951894845301, 7.483314773547883, 9.327379053088816, 7.937253933193772, 2.8284271247461903, 8.54400374531753]

  // ageMap2
  [5.744562646538029, 5, 3.4641016151377544, 4.47213595499958, 4.123105625617661, 5.830951894845301, 7.483314773547883, 9.327379053088816, 7.937253933193772, 2.8284271247461903, 8.54400374531753]

</script>