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: 3 months ago

Test name	Executions per second
WeakMap set	10569102.0 Ops/sec
Symbol Property set	11138975.0 Ops/sec
WeakMap get	5211423.5 Ops/sec
Symbol Property get	4914573.5 Ops/sec
Symbol Property get (from own descriptor)	3157744.0 Ops/sec
Symbol Property get (if hasOwn)	2933374.2 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;

Run results for: WeakMap vs Symbol 2

WeakMap set

Symbol Property set

WeakMap get

Symbol Property get

Symbol Property get (from own descriptor)

Symbol Property get (if hasOwn)