Run results for: Dynamic class vs object

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

static class

1.5M/s

object

1.5M/s

dynamic class

191K/s

View exact numbers

Test name	Executions per second
✓ static class	1,542,258 Ops/sec
object	1,471,186 Ops/sec
dynamic class	190,963 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