Run results for: Reflect.construct vs new and setPrototypeOf

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 10 months ago

Benchmark engine: Benchmark.js

new and setPrototypeOf

59.5M/s

Reflect.construct

43.5M/s

View exact numbers

Test name	Executions per second
✓ new and setPrototypeOf	59,456,628 Ops/sec
Reflect.construct	43,468,056 Ops/sec

Script Preparation code:

function A() {}
A.prototype.x = 10;

function B() {
  const a = new A()
  Object.setPrototypeOf(a, B.prototype)
}
B.prototype.y = 11;


function C() {
  const a = Reflect.construct(A, [], C)
}
C.prototype.z = 12;

Tests:

new and setPrototypeOf
new B()
Reflect.construct
new C()