how to get the key of a javasript object code example

Example 1: get first object key javascript

var example = {
    foo1: { /* stuff1 */},
    foo2: { /* stuff2 */},
    foo3: { /* stuff3 */}
};

let [first] = Object.keys(example)

console.log(first)

Example 2: js object keys

var myObj = {no:'u',my:'sql'}
var keys = Object.keys(myObj);//returnes the array ['no','my'];