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Performance.now() impact
(version: 1)
Comparing performance of:
indexOf vs indexOf + p.now vs indexOf + Date.now
Created:
one year ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div></div>
Script Preparation code:
window.regexStart = /^test/; window.regexEnd = /test$/; window.match = 'test'; window.matchLength = window.match.length; var data = window.data = []; const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; var TOTAL_STRINGS = window.TOTAL_STRINGS = 100000; function getRandomInt(max) { return Math.floor(Math.random() * max); } function makeRandomString(len) { var text = ""; for( var i=0; i < len; i++ ) { text += possible.charAt(getRandomInt(possible.length)); } return text; } while (data.length < TOTAL_STRINGS) { data.push(makeRandomString(getRandomInt(20))); }
Tests:
indexOf
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; str.indexOf(match) === 0; x += 1; }
indexOf + p.now
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; performance.now() str.indexOf(match) === 0; x += 1; performance.now() }
indexOf + Date.now
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; Date.now() str.indexOf(match) === 0; x += 1; Date.now() }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
indexOf
indexOf + p.now
indexOf + Date.now
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36
Browser/OS:
Chrome 137 on Mac OS X 10.15.7
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=610868" width="100%" height="500px"></iframe>
indexOf
17K/s
indexOf + Date.now
177/s
indexOf + p.now
58/s
View exact numbers
Test name
Executions per second
✓
indexOf
17,409 Ops/sec
indexOf + Date.now
177 Ops/sec
indexOf + p.now
58 Ops/sec
Related benchmarks
.indexOf vs .startsWith
.indexOf vs .startsWith vs .substr
Regex vs endsWith vs indexOf vs lastIndexOf
Regex vs .indexOf & .lastIndexOf vs .startsWith & .endsWith
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