Performance of Array vs. Object (v143)

Revision 143 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; i += 1) {
      var o = {
        payload: i
      };
      arr.push(o);
      obj[i] = o;
    }
    var arrLen = arr.length;
    var objLen = Object.keys(obj).length;

Test runner

Ready to run.

Testing in
TestOps/sec
Array Performance
var sum = 0;
for (var x = 0; x < arrLen; ++x) {
  sum += arr[x].payload
}
ready
Object Performance
var sum = 0;
for (var x = 0; x < objLen; ++x) {
  sum += obj[x].payload
}
ready
Array performance (test fetching length)
var sum = 0,
  len = arr.length;
for (var x = 0; x < len; ++x) {
  sum += obj[x].payload
}
ready
Object performance (test fetching length)
var sum = 0,
  len = Object.keys(obj).length;
for (var x = 0; x < len; ++x) {
  sum += obj[x].payload
}
ready

Revisions

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