​

    let list = []

    list.push("first")

    list.push("second")

    list.push("third")

    list.push("fourth")

    list[3] = "last"  

    print(list)

    let obj = {}

    obj.spring = 'green'

    obj.summer = 'yellow'

    obj.fall = 'brown'

    obj['winter'] = 'blue'  

    print(obj)

}

​