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Run results for:
Object.freeze vs Object.seal (only property access)
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Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.5
Device Platform:
Mobile
Date tested:
9 months ago
Test name
Executions per second
normal
180287536.0 Ops/sec
freeze
184417872.0 Ops/sec
seal
303668192.0 Ops/sec
Script Preparation code:
var normal = { x: 0, y: 0 }; var freeze = Object.freeze({ x: 0, y: 0 }); var seal = Object.seal({ x: 0, y: 0 });
Tests:
normal
if (normal.x + normal.y) throw new Error("Wrong");
freeze
if (freeze.x + freeze.y) throw new Error("Wrong")
seal
if (seal.x + seal.y) throw new Error("Wrong")