gistfile1.js

function testWithoutParentheses() {
  var start = new Date();
  var end;
  var a = 0;
  for (var i = 0; i < 1000000000; i++)
    if (i % 2 == 0)
      a++;
  end = new Date();
  return end-start;
}

function testWithParentheses() {
  var start = new Date();
  var end;
  var a = 0;
  for (var i = 0; i < 1000000000; i++) {
    if (i % 2 == 0) {
      a++;
    }
  }
  end = new Date();
  return end-start;
}

function benchmark() {
  var wins1 = 0;
  var wins2 = 0;
  var without, withi, diff;
  for (var i = 0; i < 10; i++) {
    without = testWithoutParentheses();
    withi = testWithParentheses();
    diff = without - withi;
    console.log((i + 1) + " iteration: { with: " + withi + "; without: " + without + "; diff: " + diff + " }");
    if (diff > 0)
      wins1++;
    else
      wins2++;
  }
  console.log("without: " + wins1 + ", with: " + wins2);
}