Run results for: WeakMap vs Symbol 2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/129.0.6668.46 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 129

Operating system: iOS 17.6

Device Platform: Mobile

Date tested: one year ago

Symbol Property set

11.1M/s

WeakMap set

10.6M/s

WeakMap get

5.2M/s

Symbol Property get

4.9M/s

Symbol Property get (from own descriptor)

3.2M/s

Symbol Property get (if hasOwn)

2.9M/s

View exact numbers

Test name	Executions per second
✓ Symbol Property set	11,138,975 Ops/sec
WeakMap set	10,569,102 Ops/sec
WeakMap get	5,211,424 Ops/sec
Symbol Property get	4,914,574 Ops/sec
Symbol Property get (from own descriptor)	3,157,744 Ops/sec
Symbol Property get (if hasOwn)	2,933,374 Ops/sec

Script Preparation code:

var to0 = {};
var to1 = {};
var wm = new WeakMap();
var sy = Symbol();
wm.set(to1, 1);
to1[sy] = 1;
window.r = 0

Tests:

WeakMap set
wm.set(to0, 1);
Symbol Property set
to0[sy] = 1;
WeakMap get
r = wm.get(to1);
Symbol Property get
r = to1[sy];
Symbol Property get (from own descriptor)
r = Object.getOwnPropertyDescriptor(to1, sy).value;
Symbol Property get (if hasOwn)
r = Object.hasOwn(sy) ? to1[sy] : undefined;