Run results for: Array vs object

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3252.0 Safari/537.36

Browser: Chrome 64

Operating system: Windows

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
Array	47473.9 Ops/sec
Object	732671.7 Ops/sec

Script Preparation code:

var n = 100;
var a = [];
var obj = {};
for (var i=0; i<n; i++) {
  a[i] = i;
  obj["obj" + i] = i;
}

Tests:

Array
r = Math.floor(Math.random()*n); for (var i=0; i<n; i++) { if (a[i] == r) break; }
Object
r = Math.floor(Math.random()*n); var i = obj["obj"+r];