MeasureThat.net

Run results for: WeakMap vs Symbol 2

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36
Chrome 128
Windows
Desktop
6 months ago
Test name Executions per second
WeakMap set 12726717.0 Ops/sec
Symbol Property set 13497805.0 Ops/sec
WeakMap get 6409639.0 Ops/sec
Symbol Property get 6529689.0 Ops/sec
Symbol Property get (from own descriptor) 4280086.0 Ops/sec
Symbol Property get (if hasOwn) 3817115.0 Ops/sec
Script Preparation code:
AخA
 
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;