A simple script to help you when you need to get some nested property using strings, special when you are inside reflections.

byString.js

Object.byString = function(o, s) {
    s = s.replace(/\[(\w+)\]/g, '.$1');
    s = s.replace(/^\./, '');
    var a = s.split('.');
    while (a.length) {
        var n = a.shift();
        if (n in o) {
            o = o[n];
        } else {
            return;
        }
    }
    return o;
};

var cliente = {
  id: 1,
  nome: "Js",
  contacts:{
    phone: "55-45-0000-0000",
    cellphone: "55-55-5555-5555",
    mail:"js@js.com"
  }
};

var desiredProperty = "cliente.contacts.phone"

// by reflection.
console.log(Object.byString(cliente, desiredProperty));
// normal way 
console.log(cliente.contacts.phone);

// results.
// "55-45-0000-0000"
// "55-45-0000-0000"