Run results for: Dynamic class vs object

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

object

5.4M/s

static class

4.7M/s

dynamic class

661K/s

View exact numbers

Test name	Executions per second
✓ object	5,381,154 Ops/sec
static class	4,663,035 Ops/sec
dynamic class	661,392 Ops/sec

Script Preparation code:

function newObj() {
  return {aaa: 42, bbb: "hello"}
}

function newClass() {
  return new class {
    aaa = 42
    bbb = "hello"
  }
}

class StaticClass {
  aaa = 42
  bbb = "hello"
}

window.StaticClass = StaticClass

Tests:

dynamic class
let obj = newClass() window.aaa = obj.aaa window.bbb = obj.bbb
object
let obj = newObj() window.aaa = obj.aaa window.bbb = obj.bbb
static class
let obj = new StaticClass() window.aaa = obj.aaa window.bbb = obj.bbb