const langauges = ["English", "Spanish", "French"]; let data = [ {id: 1, name: "Ade", age: "34"}, {id: 2, name: "James", age: "23"}, {id: 3, name: "Jude", age: "45"}, {id: 4, name: "Bimbo", age: "14"}, {id: 5, name: "Wale", age: "3"}, ]; const newData = data.map((item) => ({ ...item, status: item.age > 20 ? "old" : "young" })); console.log(newData);