var numbers1 = [10, 30, 50, 70, 90]; var numbers2 = new Array(20, 40, 60, 80, 100); var mixedArr = ['a', 1, 'b', 2, new Date(), "today"]; var objArr = [ { "id" : 20192010, "name" : "HongGilDong", "dept" : "Software" }, { "id" : 20192011, "name" : "KimSanrang", "dept" : "Business Management" }, { "id" : 20192012, "name" : "KangDongSu", "dept" : "Computer Engineering" } ]; console.log(numbers1); console.log(numbers2); console.log(mixedArr); console.log(objArr[2].name, objArr[2].dept);