Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>Click the button to get a new array with the full name of each person in the array.</p>
<button onclick="myFunction()">Try it</button>

<p>New array: <span id="demo"></span></p>

<script>
var persons = [
    {firstname : "Malcom", lastname: "Reynolds"},
    {firstname : "Kaylee", lastname: "Frye"},
    {firstname : "Jayne", lastname: "Cobb"}
];


function getFullName(item,index) {
    var fullname = [item.firstname,item.lastname].join(" ");
    return fullname;
}

function myFunction() {
    document.getElementById("demo").innerHTML = persons.map(getFullName);
}
</script>

</body>
</html>