Performance of Array vs. Object (v43)

Revision 43 of this benchmark created by Dirk on

Description

Added tests using Underscore.js

Preparation HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.2/underscore-min.js"></script>

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, len = arr.length; x<len; ++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, len = keys.length;x<len; ++x) {
    sum += obj[keys[x]].payload
}
ready
Array in
var sum = 0;
for (var x in arr) {
    sum += x.payload
}
ready
Array using Underscore.js
var sum = 0;
_.each(arr, function(x) {
    sum += x.payload
});
ready
Object using Underscore.js
var sum = 0;
_.each(obj, function(x) {
    sum += x.payload
});
ready

Revisions

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