closure performance investigation

closed_declaration.js

(function () {

var z = 1;

function add (x, y) {
  z = -z;
  return x + y + z;
}

function f () {
  var sum = 0;
  for (var i = 0; i < 10000; i++) {
    sum = add(sum, i);
  }
  //if (sum != 49995000) throw "argh";
}

function measure(f) {
  var start = new Date().valueOf();
  for (var i = 0; i < 100000; i++) {
    f();
  }
  var end = new Date().valueOf();
  print(end - start);
}

measure(f); // 4.44s+

}) ();

closed_expression.js

(function () {

var z = 1;

var add = function (x, y) {
  z = -z;
  return x + y + z;
}

var f = function () {
  var sum = 0;
  for (var i = 0; i < 10000; i++) {
    sum = add(sum, i);
  }
  //if (sum != 49995000) throw "argh";
}

function measure(f) {
  var start = new Date().valueOf();
  for (var i = 0; i < 100000; i++) {
    f();
  }
  var end = new Date().valueOf();
  print(end - start);
}

measure(f); // 4.42s+

}) ();

open_declaration.js

//(function () {

var z = 1;

function add (x, y) {
  z = -z;
  return x + y + z;
}

function f () {
  var sum = 0;
  for (var i = 0; i < 10000; i++) {
    sum = add(sum, i);
  }
  //if (sum != 49995000) throw "argh";
}

function measure(f) {
  var start = new Date().valueOf();
  for (var i = 0; i < 100000; i++) {
    f();
  }
  var end = new Date().valueOf();
  print(end - start);
}

measure(f); // 3.63s+

//}) ();

open_expression.js

//(function () {

var z = 1;

var add = function (x, y) {
  z = -z;
  return x + y + z;
}

var f = function () {
  var sum = 0;
  for (var i = 0; i < 10000; i++) {
    sum = add(sum, i);
  }
  //if (sum != 49995000) throw "argh";
}

function measure(f) {
  var start = new Date().valueOf();
  for (var i = 0; i < 100000; i++) {
    f();
  }
  var end = new Date().valueOf();
  print(end - start);
}

measure(f); // 9.70s+

//}) ();