Question

Can we attach arraylist or function with a javascript object at runtime

function abc(){
        this.a = 1;
        this.b = 2;
    }
    var obj = new abc();
    obj.list.add("abc"); // list is not declare in class  abc 

Answer 1

function abc(){
    this.a = 1;
    this.b = 2;
}
var obj = new abc();
obj.list = ["abc"];