Run results for: Object.defineProperty vs direct assignment (ES6, minimal GC)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser: Chrome 141

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

direct assign

75K/s

defineProperty

15K/s

View exact numbers

Test name	Executions per second
✓ direct assign	74,514 Ops/sec
defineProperty	14,739 Ops/sec

Script Preparation code:

const val_obj = {
    value: null,
    configurable: true,
    enumerable: true,
    writable: true
};

function val(value) {
    val_obj.value = value;
    return val_obj;
}

Tests:

defineProperty
let key = 'something'; const target = {}; for (let i=0; i<1000; i++) Object.defineProperty(target, i, val(key+i));
direct assign
let key = 'something'; const target = {}; for (var i=0; i<1000; i++) target[i] = key+i;