Performance of Array vs. Object (v63)

Revision 63 of this benchmark created on

Description

After seeing http://jsperf.com/javascript-associative-vs-non-associative-arrays, I thought the test could be improved.

Setup

var arr = [],
      i,
      obj = {};
    for (i = 0; i++ < 10000;) {
      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 = arr.length - 1; x >= 0; --x) {
  sum += arr[x].payload
}
ready
Object Performance
var sum = 0,
  x;
for (x in obj) {
  if (!obj.hasOwnProperty(x)) continue;
  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
Object.keys() 1
var sum = 0;
var keys = Object.keys(obj);
for (var x = 0, len = keys.length; x < len; ++x) {
  sum += obj[keys[x]].payload
}
ready
Object.keys() 2
var sum = 0;
Object.keys(obj).forEach(function(keys) {
  sum += obj[keys].payload
});
ready
while
var sum = 0, x = 0;
while (x < arr.length) {
  sum += arr[x].payload;
  x += 1;
}
ready

Revisions

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