performance: improved perfs by circa 50%

[Cadienvan]

Moving from the regexp approach to a loop based one.

Performances improved by 50% in my benchmark. I did that using the following code:

const mjn = require("./dist/main.js");
const { performance } = require("perf_hooks");

const start = performance.now();

const SimpleObj = {
  id: 29002,
  name: {
    first: "John",
    last: "Doe"
  },
  birth: {
    year: 1950,
    month: "Jan",
    day: 29
  },
  contacts: {
    email: {
      work: "foo@johndoefoo.foo",
      home: null
    }
  },
  children_ids: [29182, 29381, 29383]
};

const operationsToDo = [
  () => mjn(SimpleObj, "name.first"),
  () => mjn(SimpleObj, "name.last"),
  () => mjn(SimpleObj, "birth.year"),
  () => mjn(SimpleObj, "birth.month"),
  () => mjn(SimpleObj, "birth.day"),
  () => mjn(SimpleObj, "contacts.email.work"),
  () => mjn(SimpleObj, "contacts.email.home"),
  () => mjn(SimpleObj, "children_ids[0]"),
  () => mjn(SimpleObj, "children_ids[1]"),
  () => mjn(SimpleObj, "children_ids[2]")
];

for (let i = 0; i < 100000; i++) {
  operationsToDo.forEach(operation => operation());
}

const end = performance.now();

console.log("Time taken: ", end - start);

And time taken went from 680-690ms to 320-340ms.