notmaybe

notmaybe.js

const data = { user: { address: { street: "my street" } } };
const data2 = { user: {} };
const proxy = obj => new Proxy(obj, { get });
const get = (t, p) =>
  t && t[p] && (typeof t[p] === "object") ? proxy(t[p]) : t[p] ? t[p] : "";
const safe = obj => proxy(obj);

var out = safe(data).user.address.street;
var out2 = safe(data2).user.address.street;
console.log(out); // my street
console.log(out2); // undefined