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Run results for:
Split vs substring with concat
References string parts to test hidden performance optimizations between the two implementations by not throwing away the results of the operation.
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<iframe src="https://measurethat.net/Embed?id=523555" 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/124.0.0.0 Safari/537.36
Browser:
Chrome 124
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Split and concat
41514208.0 Ops/sec
Substring and concat
175403952.0 Ops/sec
Tests:
Split and concat
const email = 'some.long.email.addr@example.org'; const [part1, part2] = email.split('@'); const joined = part1 + '@' + part2
Substring and concat
const email = 'some.long.email.addr@example.org'; const part1 = email.substring(0, email.indexOf('@')); const part2 = email.substring(email.indexOf('@') + 1); const joined = part1 + '@' + part2;