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
Checking performance of Array.reverse() vs a quick while loop.
<script>
var ar = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
var backwardI = len - 1;
var forwardI = 0;
var len = ar.length;
var reverse = function(arr) {
var result = [],
ii = arr.length;
for (var i = ii - 1; i >= 0; i--) {
result.push(arr[i]);
}
return result;
}
Array.prototype.inlinereverse = function() {
var len = this.length,
forwardI = 0;
while (forwardI < len) {
var end = (len - 1) - forwardI;
this.push(this[end]);
this.splice(end, 1);
forwardI++;
}
}
</script>
Ready to run.
Test | Ops/sec | |
---|---|---|
Array.reverse() |
| ready |
Backward while loop |
| ready |
Forward while loop |
| ready |
reverse func |
| ready |
inline forward while loop |
| ready |
inline new array loop |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.