Run results for: WeakMap vs Symbol Property vs String Property

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Symbol Property get

12.4M/s

String Property set

12.4M/s

Symbol Property set

12.4M/s

String Property get

12.4M/s

WeakMap get

11.8M/s

WeakMap set

11.6M/s

View exact numbers

Test name	Executions per second
✓ Symbol Property get	12,415,512 Ops/sec
String Property set	12,414,869 Ops/sec
Symbol Property set	12,386,922 Ops/sec
String Property get	12,380,997 Ops/sec
WeakMap get	11,753,183 Ops/sec
WeakMap set	11,610,828 Ops/sec

Script Preparation code:

var to0 = {};
var to1 = {};
var to2 = {};
var wm = new WeakMap();
var sy = Symbol();
var prop = 'aaa'
wm.set(to1, 1);
to1[sy] = 1;
to2[prop] = 1;

Tests:

WeakMap set
wm.set(to0, 1);
Symbol Property set
to0[sy] = 1;
WeakMap get
let r = wm.get(to1);
Symbol Property get
let r = to1[sy];
String Property set
to2[prop] = 1;
String Property get
let r = to2[prop];