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
test
const decoder = new TextDecoder('utf-8');
// const strLen = 25e6;
const strLen = 100;
const data = new Uint8Array(new Array(strLen).fill(65));
const customDecode = function (octets) {
var string = "";
var i = 0;
while (i < octets.length) {
var octet = octets[i];
var bytesNeeded = 0;
var codePoint = 0;
if (octet <= 0x7F) {
bytesNeeded = 0;
codePoint = octet & 0xFF;
} else if (octet <= 0xDF) {
bytesNeeded = 1;
codePoint = octet & 0x1F;
} else if (octet <= 0xEF) {
bytesNeeded = 2;
codePoint = octet & 0x0F;
} else if (octet <= 0xF4) {
bytesNeeded = 3;
codePoint = octet & 0x07;
}
if (octets.length - i - bytesNeeded > 0) {
var k = 0;
while (k < bytesNeeded) {
octet = octets[i + k + 1];
codePoint = (codePoint << 6) | (octet & 0x3F);
k += 1;
}
} else {
codePoint = 0xFFFD;
bytesNeeded = octets.length - i;
}
string += String.fromCodePoint(codePoint);
i += bytesNeeded + 1;
}
return string
};
Ready to run.
Test | Ops/sec | |
---|---|---|
native decoder |
| ready |
custom decoder |
| ready |
native decoder + subarray |
| ready |
custom decoder + subarray |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.