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Run results for:
Testing for false vs === undefined vs hasOwnProperty for undefined member
Is there a performance benefit to replacing === undefined with a logical test?
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<iframe src="https://measurethat.net/Embed?id=554988" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36
Browser:
Chrome 128
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
test truth
157.6M/s
test hasOwnProperty
92.6M/s
test undefined
15.4M/s
View exact numbers
Test name
Executions per second
✓
test truth
157,604,176 Ops/sec
test hasOwnProperty
92,550,024 Ops/sec
test undefined
15,435,528 Ops/sec
Tests:
test truth
var n = {}; while(true) { if(!n.foo) break; }
test undefined
var n = {}; while(true) { if(n.foo===undefined) break; }
test hasOwnProperty
var n = {}; while(true) { if(!n.hasOwnProperty('foo')) break; }