Performance of Array vs. Object (v254)

Revision 254 of this benchmark created by Dan Bitter on

Setup

var arr = [],
      i,
      obj = {};
  for(i = 0; i < 10000; i += 1) {
  if(Math.random() > 0.5) {
      var o = {payload:i};
      arr.push(o);
      obj[i] = o;
  }
  }

Test runner

Ready to run.

Testing in
TestOps/sec
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) {
if(obj[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
var sum = 0;
for (var x=0; x<arr.length; ++x) {
    if(arr[x]) {
sum += arr[x].payload
}
}
ready

Revisions

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