Run results for: WeakMap vs Symbol 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Symbol Property set

13.5M/s

WeakMap set

12.7M/s

Symbol Property get

6.5M/s

WeakMap get

6.4M/s

Symbol Property get (from own descriptor)

4.3M/s

Symbol Property get (if hasOwn)

3.8M/s

View exact numbers

Test name	Executions per second
✓ Symbol Property set	13,497,805 Ops/sec
WeakMap set	12,726,717 Ops/sec
Symbol Property get	6,529,689 Ops/sec
WeakMap get	6,409,639 Ops/sec
Symbol Property get (from own descriptor)	4,280,086 Ops/sec
Symbol Property get (if hasOwn)	3,817,115 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;