isPrime

JavaScript performance comparison

Test case created by Renosis

Info

Testing a hopefully more optimized version of my isPrime function, versus an older version.

Preparation code

``<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> ``

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
Old isPrime
``for(var i = 0; i < 10000; i++) { isPrime(i);}function isPrime(n) {        if(n === 1 || n < 1 || (n > 5 && n % 5 === 0) || (n > 2 && n % 2 === 0) || (n > 3 && n % 3 === 0) || (n > 7 && n % 7 === 0)) { return false; }    for(var i = 2; i <= Math.sqrt(n); i++) {        if(n % i === 0) { return false; }        }    return true;    }``
pending…
New isPrime
``for(var i = 0; i < 10000; i++) { isPrime(i);}function isPrime(n) {    if(n === 2) { return true; }    if(n === 1 || n < 1 || (n > 5 && n % 5 === 0) || (n % 2 === 0) || (n > 3 && n % 3 === 0) || (n > 7 && n % 7 === 0)) { return false; }    var limit = Math.sqrt(n);    for(var i = 3; i <= limit; i+= 2) {        if(n % i === 0) { return false; }        }    return true;    }``
pending…
New isPrime minus conditionals
``for(var i = 0; i < 10000; i++) { isPrime(i);}function isPrime(n) {    if(n === 2) { return true; }    if(n === 1) { return false; }    var limit = Math.sqrt(n);    for(var i = 3; i <= limit; i+= 2) {        if(n % i === 0) { return false; }        }    return true;    }``
pending…
Old isPrime with limit
``for(var i = 0; i < 10000; i++) { isPrime(i);}function isPrime(n) {        if(n === 1 || n < 1 || (n > 5 && n % 5 === 0) || (n > 2 && n % 2 === 0) || (n > 3 && n % 3 === 0) || (n > 7 && n % 7 === 0)) { return false; }    var limit = Math.sqrt(n);    for(var i = 2; i <= limit; i++) {        if(n % i === 0) { return false; }        }    return true;    }``
pending…

You can edit these tests or add even more tests to this page by appending `/edit` to the URL.