const obj = { name: 'Jean-Luc Picard', rank: 'Captain' }; // Prints "name Jean-Luc Picard" followed by "rank Captain" Object.keys(obj).forEach(key => { console.log(key, obj[key]); });
let yourArray = [{id:3},{id:2},{id:4}] yourArray.forEach((item, index) => { item.id = index })