Performance of Array vs. Object (v21)

Revision 21 of this benchmark created on

Setup

var arr = [],
      i, obj = {};
  for (i = 0; i < 10000; i += 1) {
    var o = {
      payload: i
    };
    arr.push(o);
    obj[i] = o;
  }

Test runner

Ready to run.

Testing in
TestOps/sec
Array Performance
var sum = 0;
for (var x = 0; x < arr.length; ++x) {
  sum += arr[x].payload
}
ready
Object Performance
var sum = 0;
for (var x in obj) {
  sum += obj[x].payload;
}
ready
Object Performance using known length
var sum = 0;
for (var x = 0; x < 10000; ++x) {
  sum += obj[x].payload
}
ready
Using Object.keys()
var sum = 0;
var keys = Object.keys(obj);
for (var x = 0; x < keys.length; ++x) {
  sum += obj[keys[x]].payload
}
ready
Using forEach
var sum = 0;
arr.forEach(function(obj) {
  sum += obj.payload;
});
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.