Benchmarks for delete, Reflect.deleteProperty and the spread operator

benchmark-delete-vs-spread.js

import Benchmark from "benchmark";

function useDelete() {
  const obj = {};
  obj.a = 1;
  obj.b = 2;
  delete obj.b;
}

function useReflect() {
  const obj = {};
  obj.a = 1;
  obj.b = 2;
  Reflect.deleteProperty(obj, "b");
}

function useSpread() {
  const obj = {};
  obj.a = 1;
  obj.b = 2;
  const { b, ...rest } = obj;
}

new Benchmark.Suite()
  .add("delete", function () {
    useDelete();
  })
  .add("reflect", function () {
    useReflect();
  })
  .add("spread", function () {
    useSpread();
  })
  .on("cycle", function (event) {
    console.log(String(event.target));
  })
  .on("complete", function () {
    console.log("Fastest is " + this.filter("fastest").map("name"));
  })
  .run();

// My results:
// delete x 19,286,059 ops/sec ±0.71% (91 runs sampled)
// reflect x 18,877,376 ops/sec ±0.72% (93 runs sampled)
// spread x 19,258,554 ops/sec ±0.93% (89 runs sampled)
// Fastest is delete,spread