how to map over array code example

Example 1: how the map function works javascript

const array = [2, 5, 9];
let squares = array.map((num) => num * num);

console.log(array); // [2, 5, 9]
console.log(squares); // [4, 25, 81]

Example 2: array map

let A = [{ x:'x', y:'y' }, { x:'x', y:'y' }];

let result = A.map(({y,...rest})=> ({...rest,v:y}));

console.log(result);