Performance of Array vs. Object (v68)

Revision 68 of this benchmark created on

Setup

var arr = [],
    i,
    obj = {};
  for (i = 0; i < 100000; 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 < 100000; ++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 < 100000; ++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
Array Performance known length
var sum = 0;
for (var x = 0; x < 100000; ++x) {
  sum += arr[x].payload
}
ready
Object Performance for-in
var sum = 0;
var keys = Object.keys(obj);
for (var x in obj) {
  sum += obj[x].payload
}
ready

Revisions

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