Run results for: Inline anonymous classes

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Windows 7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Anonymous redefined class	30122.4 Ops/sec
Predefined shared class	69363.8 Ops/sec
Builtin error with assigned properties	61794.2 Ops/sec

Script Preparation code:

class PredefinedError extends Error {
  foo = 5;
  bar = "foo";
}

function throwShared() {
  throw new PredefinedError("Error message");
}

function throwAnon() {
  throw new class extends Error {
    foo = 5;
    bar = "foo";
  }("Error message");
}

function throwExtended() {
  throw Object.assign(new Error("Error message"), {
    foo: 5,
    bar: "foo",
  });
}

Tests:

Anonymous redefined class
let x = 0; try { throwAnon(); } catch(e) { x += e.foo; }
Predefined shared class
let x = 0; try { throwShared(); } catch(e) { x += e.foo; }
Builtin error with assigned properties
let x = 0; try { throwExtended(); } catch(e) { x += e.foo; }

Run results for: Inline anonymous classes

https://es.discourse.group/t/error-detail/1857/49

Anonymous redefined class

Predefined shared class

Builtin error with assigned properties