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Run results for:
checks if object has any key - Object.keys vs for key in 2
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0
Browser:
Firefox 139
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Object.keys
78585144.0 Ops/sec
for key .. in
39456268.0 Ops/sec
Script Preparation code:
var obj = {} new Array(1000).map((item, index) => { obj[index] = index })
Tests:
Object.keys
!!Object.keys(obj).length
for key .. in
for(let key in obj){ return true; } return false