Noissue - Compare individual characters instead of substring

Noissue - Compare individual characters instead of substring

[Manish Jethani, 2018-05-02 23:39:00]

Patch Set 1

Turns out comparing individual characters is significantly faster on both V8 and
Spidermonkey.

(function ()
{
  let array = new Array(10000000);
  for (let i = 0; i < array.length; i++)
  {
    if (Math.random() < .2)
      array[i] = "@@foo";
    else
      array[i] = "foo";
  }

  let count = 0;
  let start = Date.now();

  for (let i = 0; i < array.length; i++)
  {
    if (array[i].substr(0, 2) == "@@")
      count++;
  }

  console.log("time:", Date.now() - start);
  console.log("count:", count);
})();

Replace this line:

    if (array[i].substr(0, 2) == "@@")

With this:

    if (array[i][0] == "@" && array[i][1] == "@")

On V8 I'm getting 3x, on Spidermonkey up to 4x.

[kzar, 2018-05-03 16:06:42]

Nice, LGTM