Run results for: Object key access vs array access

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object access	224008.5 Ops/sec
Array index	327731.7 Ops/sec

Script Preparation code:

var items = Array.from(Array(1000), (_,x) => ({key: x, value: x*10}));

var objContainer = {};
var arrContainer = [];

for (let i = 100; i >= 0; i--) {
  const index = Math.floor(Math.random() * 1000);
  const item = items[index];
  objContainer[item.key] = item;
  arrContainer.push(item)
}

Tests:

Object access
for (let i = 100; i >= 0; i--) { objContainer[i] }
Array index
for (let i = 100; i >= 0; i--) { arrContainer[i] }

Run results for: Object key access vs array access

Test speed of object access by key vs array index

Object access

Array index