Run results for: Map vs Object: Full benchmark

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.1.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Map Write	12522.3 Ops/sec
Object Write	14944.6 Ops/sec
Map Read	9556.3 Ops/sec
Object Read	9178.7 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