JS Array Map

js_array_map.js

var users = [
    { id: 1, name: "Joseph" },
    { id: 2, name: "Tressa" }
];

var user_names = users.map((user) => {
    return user.name;
});
console.log('names', user_names);
// will produce >>> ["Joseph", "Tressa"]

var usernames_formatted = users.map((user, key) => {
    var name = user.name;
    return (key%2 == 0) ? name.toLowerCase() : name;
});
console.log('formatted', usernames_formatted);
// will produce >>> ["joseph", "Tressa"]