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Run results for:
object property initialize vs add dynamically
v8 engine optimization check
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<iframe src="https://measurethat.net/Embed?id=606777" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0
Browser:
Firefox 138
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
initialize with object literal
656.6M/s
add properties dynamically
92.3M/s
View exact numbers
Test name
Executions per second
✓
initialize with object literal
656,555,520 Ops/sec
add properties dynamically
92,314,032 Ops/sec
Tests:
add properties dynamically
const user = {}; user.name = 'John'; user.age = 30;
initialize with object literal
const user = { name: 'John', age: 30 };