this_is_a_test

test.js

//2012-09-13 jorge@jorgechamorro.com

var ctr, i, t, k= 1e8;

function ƒ (i) { ctr+= i }
function begin () { i= k, ctr= 0; while (Date.now() === (t= Date.now())) ; }
function end (s,t) { console.log(s+ ((Date.now()- t)*1e6/k).toFixed(2)+ 'ns') }


begin();
while (i--) (function (i) { ctr+= i })(i);
end("(function (i) { ctr+= i })(i) -> ", t);


begin();
while (i--) ƒ(i);
end("ƒ(i) -> ", t);

/*

$ node test.js

(function (i) { ctr+= i })(i) -> 39.74ns
ƒ(i) -> 18.99ns

*/