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<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Arrays</h2>
<p>Compute a new array with the full name of each person in the old array:</p>
<p id="demo"></p>
<script>
const persons = [
  {firstname : "Malcom", lastname: "Reynolds"},
  {firstname : "Kaylee", lastname: "Frye"},
  {firstname : "Jayne", lastname: "Cobb"}
];
document.getElementById("demo").innerHTML = persons.map(getFullName);
function getFullName(item) {
  return [item.firstname,item.lastname].join(" ");
}
</script>
</body>
</html>