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Run results for:
Comparing date allocation
Checking how expensive creating a date is compared to deferring it to be done in a lazy fashion later on.
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<iframe src="https://measurethat.net/Embed?id=525872" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Date from string
9243965.0 Ops/sec
Just assigning string
502514752.0 Ops/sec
Tests:
Date from string
const dateString = "2024-05-31T09:13:43.095Z"; if (/^\d+-\d+-\d+T\d+:\d+:\d+(\.\d+)?$/.test(dateString)) { dateString += 'Z'; } const result = Date.parse(dateString); isNaN(result) ? null : (result / 1000.0);
Just assigning string
const dateString = "2024-05-31T09:13:43.095Z";