A quick test for javascript object method declaration "modes".

jsFuncTest.js

function TestObj1() { this.counter = 0; this.doit = function() { return this.counter++ } };
function TestObj2() { this.counter = 0; };
TestObj2.prototype.doit = function() { return this.counter++; };
testit = function() { var testobj1 = new TestObj1();  var counter = 0; var startt1 = (new Date).getTime(); while(testobj1.doit()<1000000) { counter++ }; console.log("time for test 1: "+((new Date).getTime()-startt1)); var testobj2 = new TestObj2(); var startt2 = (new Date).getTime(); while(testobj2.doit()<1000000) { counter++ }; console.log("time for test 2: "+((new Date).getTime()-startt2));};
testit();

// Firefox 3.6 is awful slow on both methods, but the first one is a tiny bit faster than the second one (on winXP 32, AMD x2 2.2GHz 4GB ram, it does 522ms vs. 534ms).
// Firefox 4.0 is some sort of improvement, but is still godawful slow. 340ms and 350ms, respectively. I guess Tamarin does not help much on this.
// Chrome Canary Build flies on both methods, and the second one is almost 2x faster - 45ms vs. 27ms, consistently.
// Safari 5, though, stands in the middle ground on the first method, doing 127ms, but actually reaches Chrome's speed on the second test, doing 27ms too.