Answers for "array of objects for property"

get array of all property in object array

objArray = [ { foo: 1, bar: 2}, { foo: 3, bar: 4}, { foo: 5, bar: 6} ];
let result = objArray.map(a => a.foo); //[1,3,5]
//OR
let result = objArray.map(({ foo }) => foo) //[1,3,5]

javascript set property for each object in array of objects

let yourArray = [{id:3},{id:2},{id:4}] 
 yourArray.forEach((item, index) => { 
 item.id = index 
})