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<!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>