Run results for: Benchmark javascript Object vs Map

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.7 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.7.1

Device Platform: Mobile

Date tested: 10 months ago

Benchmark engine: Benchmark.js

Object Write

1.5M/s

Map Write

120K/s

Object Read

13K/s

Map Read

9K/s

View exact numbers

Test name	Executions per second
✓ Object Write	1,501,797 Ops/sec
Map Write	120,117 Ops/sec
Object Read	13,355 Ops/sec
Map Read	9,086 Ops/sec

Script Preparation code:

var size = 1000
var map = new Map()
var object = {}

var emptyMap = new Map()
var emptyObject = {}

for (var i = 0; i < size; i++) {
    map.set(i, i)
    object[i] = i
}

Tests:

Object Write
for (var i=0; i<size; i++) { emptyObject[i] = i }
Map Write
for (var i=0; i<size; i++) { emptyMap.set(i,i) }
Object Read
for (var key in object) { a = object[key] }
Map Read
for (var [key, value] of map) { a = map.get(key) }