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https://jsperf.com/negative-modulo/2
Can be accessed at:
https://jsperf.app/negative-modulo/2
Testing speed of a standard for loop vs. Array.indexOf.
<script>
var ar = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9];
Array.prototype.jsperfIndexOf = function(element,index) {
//taken from the very guts of V8 and simplified [!]
var length = this.length;
if (length == 0) return -1;
if (index == undefined) {
index = 0;
} else {
// If index is negative, index from the end of the array.
if (index < 0) {
index = length + index;
// If index is still negative, search the entire array.
if (index < 0) index = 0;
}
}
var min = index;
var max = length;
// Lookup through the array.
if (!(element == undefined)) {
for (var i = min; i < max; i++) {
if (this[i] === element) return i;
}
return -1;
}
// Lookup through the array.
for (var i = min; i < max; i++) {
if (this[i] == undefined && i in this) {
return i;
}
}
return -1;
}
</script>
Ready to run.
Test | Ops/sec | |
---|---|---|
For loop |
| ready |
indexOf |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.