how to get values from array of objects in javascript code example

Example 1: array objects to array of one property

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

Example 2: object get array of values

const data = {
    "2015": {
        "year": 2015,
        "cover": {}
    }
}

Object.entries(data).forEach(([key, value]) => console.log(key, value));

Example 3: map a property from array of objects javascript

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