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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
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