Run results for: Arguments leaking - IE version

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36 OPR/72.0.3815.320

Browser: Opera 72

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
leakyArguments	4435774.5 Ops/sec
Array.prototype.slice arguments	1962933.9 Ops/sec
copyArgs	2080071.8 Ops/sec
nonLeaky	4359842.0 Ops/sec

Script Preparation code:

var leakyArguments = function () {
  return other(arguments)
}
var nonLeakyArguments = function  (args) {
  return other(args)
}
var copyArgs = function  () {
  var array = new Array(arguments.length)

  for (var i = 0; i < array.length; i++) {
    array[i] = arguments[i]
  }

  return other(array)
}

var sliceArguments = function () {
  var array = Array.prototype.slice.apply(arguments)
  return other(array)
}

var other = function (toSum) {
  var total = 0
  for (var i = 0; i < toSum.length; i++) {
    total += toSum[i]
  }
  return total
}

Tests:

leakyArguments
leakyArguments(1, 2, 3)
Array.prototype.slice arguments
sliceArguments(1, 2, 3)
copyArgs
copyArgs(1, 2, 3)
nonLeaky
nonLeakyArguments([1, 2, 3])

Run results for: Arguments leaking - IE version

taken from https://github.com/davidmarkclements/v8-perf/blob/master/bench/arguments.js

leakyArguments

Array.prototype.slice arguments

copyArgs

nonLeaky