ネタ01

kozawa さんが言ってた == 0 のが速いんじゃね話．

#!/usr/bin/js

function bench(label, f) {
    var j;
    var t;
    t = (new Date).getTime ();
    j = f();
    print(label + " " + ((new Date).getTime () - t) + "ms/" + j + " times");
}

bench("++<Max ", function () {var j = 0;for (var i =        0; i <  1000000; i += 1) { j += 1; }  return j});
bench("-->Max ", function () {var j = 0;for (var i =        0; i > -1000000; i -= 1) { j += 1; } return j});
bench("++<Zero", function () {var j = 0;for (var i = -1000000; i <        0; i += 1) { j += 1; } return j});
bench("-->Zero", function () {var j = 0;for (var i =  1000000; i >        0; i -= 1) { j += 1; } return j});
bench("--=Zero", function () {var j = 0;for (var i =  1000000; i !=       0; i -= 1) { j += 1; } return j});

$ bench01.js
++<Max  516ms/1000000 times
-->Max  487ms/1000000 times
++<Zero 505ms/1000000 times
-->Zero 424ms/1000000 times
--=Zero 445ms/1000000 times

なんかよくわからんくなってきた．
デクリメントが早いんですかね？