Reflect.defineProperty vs #field

reflect-vs-private.js

/**
$ node node/reflect-vs-private.js
Reflect x 7,297,368 ops/sec ±0.66% (92 runs sampled)
Normal x 126,613,750 ops/sec ±0.75% (93 runs sampled)
Private x 14,083,334 ops/sec ±0.99% (87 runs sampled)
Fastest is Normal
*/

const { Benchmark } = require("benchmark");
var suite = new Benchmark.Suite();

class ReflectMe {
  constructor() {
    Reflect.defineProperty(this, "_name", {
      writable: true,
    });
  }
}

class Normal {
  constructor() {
    this.name = "aschen";
  }
}

class Private {
  #name;
  constructor() {
    this.#name = "aschen";
  }
}

let ret;
// add tests
suite
  .add("Reflect", function () {
    ret = new ReflectMe();
  })
  .add("Normal", function () {
    ret = new Normal();
  })
  .add("Private", function () {
    ret = new Private();
  })
  // add listeners
  .on("cycle", function (event) {
    console.log(String(event.target));
  })
  .on("complete", function () {
    console.log("Fastest is " + this.filter("fastest").map("name"));
  })
  // run async
  .run();