return array of a single property from array of objects code example

Example 1: 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]

Example 2: array objects to array of one property

let result = objArray.map(a => a.foo);