Run results for: __proto__ vs assign field

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

fn set proto

16.0M/s

assign field

5.5M/s

View exact numbers

Test name	Executions per second
✓ fn set proto	15,971,248 Ops/sec
assign field	5,498,878 Ops/sec

Script Preparation code:

var proto = {
	fn() {},
  	fn2() {},
  	fn3() {},
  	afn: () => {},
    afn2: () => {},
    afn3: () => {}
}

var fn = function () {}
var fn2 = function () {}
var fn3 = function () {}
var afn = () => {}
var afn2 = () => {}
var afn3 = () => {}

Tests:

fn set proto
var myfn = () => {} myfn.__proto__ = proto
assign field
var myfn2 = () => {} myfn2.fn = fn myfn2.fn2 = fn2 myfn2.fn3 = fn3 myfn2.afn = afn myfn2.afn2 = afn2 myfn2.afn3 = afn3