Run results for: class vs function constructor vs object literal vs __proto__ vs Object.create vs Object.setPrototypeOf

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

function constructor

1.2M/s

class

1.2M/s

object literal & sum.call

1.1M/s

object literal

1.1M/s

__proto__

33K/s

Object.create

14K/s

Object.setPrototypeOf

9K/s

View exact numbers

Test name	Executions per second
✓ function constructor	1,187,952 Ops/sec
class	1,180,830 Ops/sec
object literal & sum.call	1,113,326 Ops/sec
object literal	1,081,398 Ops/sec
__proto__	33,421 Ops/sec
Object.create	13,651 Ops/sec
Object.setPrototypeOf	8,934 Ops/sec

Script Preparation code:

class Cls {
  constructor(foo, bar, baz) {
    this.foo = foo;
    this.bar = bar;
    this.baz = baz;
  }
  sum() {
    return this.foo + this.bar + this.baz;
  }
}

function Fn(foo, bar, baz) {
  this.foo = foo;
  this.bar = bar;
  this.baz = baz;
}
Fn.prototype.sum = function() {
  return this.foo + this.bar + this.baz;
}

function obj(foo, bar, baz) {
  return {foo, bar, baz};
}

function sum(x) {
  return x.foo + x.bar + x.baz;
}

function sum2() {
  return this.foo + this.bar + this.baz;
}

const proto = {
  sum() {
    return this.foo + this.bar + this.baz;
  }
}


function protoCtr(foo, bar, baz) {
  return {foo, bar, baz, __proto__: proto };
}

function create(foo, bar, baz) {
  let x = Object.create(proto);
  x.foo = foo;
  x.bar = bar;
  x.baz = baz;
  return x;
}

function setproto(foo, bar, baz) {
  let x = {foo, bar, baz};
  Object.setPrototypeOf(x, proto);
  return x;
}

window.Cls = Cls
window.Fn = Fn
window.obj = obj
window.sum = sum
window.sum2 = sum2
window.protoCtr = protoCtr
window.create = create
window.setproto = setproto

Tests:

class
const ctr = window.Cls let i = 1000; let y = 0; while (i--) { let x = new ctr(1, 2, 3); y += x.foo + x.bar + x.baz; y += x.sum(); } return y;
function constructor
const ctr = window.Fn; let i = 1000; let y = 0; while (i--) { let x = new ctr(1, 2, 3); y += x.foo + x.bar + x.baz; y += x.sum(); } return y;
object literal
const ctr = window.obj; const sum = window.sum; let i = 1000; let y = 0; while (i--) { let x = ctr(1, 2, 3); y += x.foo + x.bar + x.baz; y += sum(x); } return y;
object literal & sum.call
const ctr = window.obj; const sum = window.sum2; let i = 1000; let y = 0; while (i--) { let x = ctr(1, 2, 3); y += x.foo + x.bar + x.baz; y += sum.call(x); } return y;
__proto__
const ctr = window.protoCtr let i = 1000; let y = 0; while (i--) { let x = ctr(1, 2, 3); y += x.foo + x.bar + x.baz; y += x.sum(); } return y;
Object.create
const ctr = window.create let i = 1000; let y = 0; while (i--) { let x = ctr(1, 2, 3); y += x.foo + x.bar + x.baz; y += x.sum(); } return y;
Object.setPrototypeOf
const ctr = window.setproto let i = 1000; let y = 0; while (i--) { let x = ctr(1, 2, 3); y += x.foo + x.bar + x.baz; y += x.sum(); } return y;