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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 case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

<script>
// Array Remove - By John Resig (MIT Licensed)
// simplified
Array.prototype.remove = function(ind) {
  var rest = this.slice(ind + 1);
  this.length = ind;
  return this.push.apply(this, rest);
};
</script>

Setup JS

var a = [], i = 0;
    while (i < 1000)
        a[i++] = Math.floor(Math.random() * 10);

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var b = a.slice(), i = 0, el;
while (i < b.length) {
    el = b[i++];
    if (el === 5)
        b.splice(i-1, 1);
}

Test #2

Title *

Async

Code *

var b = a.slice(), el,
i = 0, j = 0;
while (i < b.length) {
    el = b[i++];
    if (el !== 5)
        b[j++] = el;
}
b.length = j;

Test #3

Title *

Async

Code *

var b = a.slice();
var c = [], i = 0, el;
while (i < b.length) {
    el = b[i++];
    if (el !== 5)
        c[c.length] = el;
}

Test #4

Title *

Async

Code *

var b = a.slice(), i = 0, el;
while (i < b.length) {
    el = b[i++];
    if (el === 5)
        b.remove(i-1);
}