Run results for: Various ways of object creation

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 9 months ago

Test name	Executions per second
Object literals	95391768.0 Ops/sec
Object.create(null) and then set properties	12782467.0 Ops/sec
Object.create(null) with descriptors.	2097598.5 Ops/sec
new Object and then set properties	96637520.0 Ops/sec
Object literals then set prototype to null	9272074.0 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}
const store = {
    _: null
};

function do_not_optimize(v) {
    store._ = v;
}

Tests:

Object literals
let obj = { a: 0, b: 0, c: 0, d: 0 }; do_not_optimize(obj);
Object.create(null) and then set properties
let obj = Object.create(null); obj.a = 0; obj.b = 0; obj.c = 0; obj.d = 0; do_not_optimize(obj)
Object.create(null) with descriptors.
let obj = Object.create(null, { a: { value: 0, writable: true, enumerable: true, configurable: true }, b: { value: 0, writable: true, enumerable: true, configurable: true }, c: { value: 0, writable: true, enumerable: true, configurable: true }, d: { value: 0, writable: true, enumerable: true, configurable: true } }); do_not_optimize(obj);
new Object and then set properties
let obj = new Object(); obj.a = 0; obj.b = 0; obj.c = 0; obj.d = 0; do_not_optimize(obj);
Object literals then set prototype to null
let obj = { a: 0, b: 0, c: 0, d: 0 }; Object.setPrototypeOf(obj, null) do_not_optimize(obj);

Run results for: Various ways of object creation

Object literals

Object.create(null) and then set properties

Object.create(null) with descriptors.

new Object and then set properties

Object literals then set prototype to null