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
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.string/3.0.0/underscore.string.js"></script>
a = ["test"];
for (var i = 0; i < 10000; i++) {
a.push("some other stuff");
}
str = a.join();
String.prototype.startsWith = function(needle) {
return this.slice(0, needle.length) === needle;
};
String.prototype.startsWithLoop = function(needle) {
var that = this;
var ceil = needle.length;
for(var i = 0; i < ceil; i++) {
if(that[i] !== needle[i]) return false;
}
return true;
}
function startsWith(haystack, needle) {
return haystack.slice(0, needle.length) === needle;
}
function startsWithLoop(haystack, needle) {
var ceil = needle.length;
for(var i = 0; i < ceil; i++) {
if(haystack[i] !== needle[i]) return false;
}
return true;
}
Ready to run.
Test | Ops/sec | |
---|---|---|
indexOf |
| ready |
lastIndexOf |
| ready |
substring |
| ready |
slice |
| ready |
regex |
| ready |
Proto startsWith |
| ready |
startsWith |
| ready |
startsWithLoop |
| ready |
Proto startsWithLoop |
| ready |
Underscore startsWith |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.