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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

direct assign

99K/s

defineProperty

42K/s

View exact numbers

Test name	Executions per second
✓ direct assign	98,651 Ops/sec
defineProperty	41,508 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;