Run results for: arguments vs array arg

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:58.0) Gecko/20100101 Firefox/58.0

Browser: Firefox 58

Operating system: Mac OS X 10.12

Device Platform: Other

Date tested: 2024 years ago

Test name	Executions per second
arguments	2481.7 Ops/sec
array arg	10435.5 Ops/sec

Script Preparation code:

function test() {
    var v = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        v[_i] = arguments[_i];
    }
  var different = false;
  for (var j = 0; j < v.length; j++) {
    if (j % 2 === 0) different = true;
  }
  return different;
}


function test2(v) {
  var different = false;
  for (var j = 0; j < v.length; j++) {
    if (j % 2 === 0) different = true;
  }
  return different;
}

Tests:

arguments
for(var i = 0; i < 10000; i++) { test(i, i + 1, i + 2, i + 3, i + 4, i + 5); }
array arg
for(var i = 0; i < 10000; i++) { test2([i, i + 1, i + 2, i + 3, i + 4, i + 5]); }