Run results for: member vs proto member

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
aa	29856550.0 Ops/sec
bb	29859418.0 Ops/sec
xx	32835626.0 Ops/sec

Script Preparation code:

var A = class A {
	_aa = "_aa"
}

var B = class B extends A {}
var B2 = class B2 extends B {}
var B3 = class B3 extends B2 {}
var B4 = class B4 extends B3 {}
var B5 = class B5 extends B4 {}
var B6 = class B6 extends B5 {}
var B7 = class B7 extends B6 {}
var B8 = class B8 extends B7 {}
var B9 = class B9 extends B8 {}
var B10 = class B10 extends B9 {
	_bb = "_bb"
}

A.prototype._xx = "_xx"

var a = new B10()

console.log(a._aa, a._bb, a._xx)

Tests:

aa
var b = a._aa === "_aa"
bb
var b2 = a._bb === "_bb"
xx
var b3 = a._xx === "_xx"