jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.
jsperf.com URLs are mirrored at the same path, e.g:
https://jsperf.com/negative-modulo/2
Can be accessed at:
https://jsperf.app/negative-modulo/2
string StartWith function to test option in http://stackoverflow.com/questions/646628/javascript-startswith and http://jsperf.com/string-startswith/5
with short string
<script>
function startsWithCharAt(string, pattern) {
for (var i = 0, length = pattern.length; i < length; i += 1) {
if (pattern.charAt(i) !== string.charAt(i)) return false;
}
return true;
}
function startsWithArray(string, pattern) {
for (var i = 0, length = pattern.length; i < length; i += 1) {
if (pattern[i] !== string[i]) return false;
}
return true;
}
var longString1 = 'http://www.google.com';
var longString2 = 'http';
</script>Ready to run.
| Test | Ops/sec | |
|---|---|---|
| IndexOf | | ready |
| Slice | | ready |
| slice negative | | ready |
| substring | | ready |
| startsWithCharAt | | ready |
| startsWithArray | | ready |
| lastIndexOf | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.