I have an object. I would like to modify the object (not clone it) by removing all properties except for certain specific properties. For instance, if I started with this object:

var myObj={

    p1:123,

    p2:321,

    p3:{p3_1:1231,p3_2:342},

    p4:'23423',

    //....

    p99:{p99_1:'sadf',p99_2:234},

    p100:3434

}

and only want properties p1, p2, and p100, how can I obtain this object:

var myObj={

    p1:123,

    p2:321,

    p100:3434

}

I understand how I could do this with brute force, but would like a more elegant solution.