map-to-objects.js

// You have an array of user objects, each one has name, surname and id.

// Write the code to create another array from it, of objects with id and fullName, where fullName is generated from name and surname.

// For instance:

// let john = { name: "John", surname: "Smith", id: 1 };
// let pete = { name: "Pete", surname: "Hunt", id: 2 };
// let mary = { name: "Mary", surname: "Key", id: 3 };

// let users = [ john, pete, mary ];

// let usersMapped = /* ... your code ... */

// /*
// usersMapped = [
//   { fullName: "John Smith", id: 1 },
//   { fullName: "Pete Hunt", id: 2 },
//   { fullName: "Mary Key", id: 3 }
// ]
// */

// alert( usersMapped[0].id ) // 1
// alert( usersMapped[0].fullName ) // John Smith
// So, actually you need to map one array of objects to another. Try using => here. There’s a small catch.

let john = { name: "John", surname: "Smith", id: 1 };
let pete = { name: "Pete", surname: "Hunt", id: 2 };
let mary = { name: "Mary", surname: "Key", id: 3 };

let users = [ john, pete, mary ];

let usersMapped = users.map(user => {
    let fullName = user.name + " " + user.surname;
    return {
        fullName,
        id: user.id,
    }
});
     
console.log(usersMapped);
console.log(usersMapped[0].id);
// 1
console.log(usersMapped[0].fullName);
// John Smith