Run results for: Map vs Object: Full benchmark

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Object Write

19K/s

Map Write

16K/s

Map Read

13K/s

Object Read

13K/s

View exact numbers

Test name	Executions per second
✓ Object Write	18,943 Ops/sec
Map Write	16,289 Ops/sec
Map Read	12,808 Ops/sec
Object Read	12,781 Ops/sec

Script Preparation code:

var mapWrite = new Map();
var objWrite = {};

var mapRead = new Map();
var objRead = {};

var read = 'a';

mapRead.set(read, read);
objRead[read] = read;

var count = 1000;

Tests:

Map Write
for (i = 0; i < count; i++) { mapWrite.set(i, i); };
Object Write
for (i = 0; i < count; i++) { objWrite[i] = i; };
Map Read
for (i = 0; i < count; i++) { mapRead.get(read); };
Object Read
for (i = 0; i < count; i++) { objRead[read]; };

Run results for: Map vs Object: Full benchmark

Lookup of map vs object

Map Write

Object Write

Map Read

Object Read