how to write out array map function code example

Example 1: map a property from array of objects javascript

var result = objArray.map(function(a) {return a.foo;});

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);