Naive object look up.

Lookup.js

const get = (target, path) => path.split(".").reduce((value, key) => value ? value[key] : value, target)

const a = {
  b: {
    c: {
      d: "result!"
    }
  }
}

const res = get(a, "b.c.d")
console.log(res) // "result!"

const nope = get(a, "b.z.d")
console.log(nope) // "undefined"