var newArray = new Ranking(array,value,boolean);

var obj1 = [
    {
        name: "John",
        age : 17
    },
    {
        name:"Martha",
        age : 18
    },
    {
        name:"Frank",
        age : 16
    }
];

var newArray = new Ranking(obj1,"age",true); //if boolean is true output will be 18-17-16
                                          //else the output will be 16-17-18
console.log(newArray.ranked);

[
    {
        name:"Martha",
        age : 18
    },
    {
        name:"John,
        age : 17
    },
    {
        name:"Frank",
        age : 16
    }
]