Run results for: Benchmark javascript Object vs Map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Object Write

1.7M/s

Map Read

67K/s

Map Write

60K/s

Object Read

22K/s

View exact numbers

Test name	Executions per second
✓ Object Write	1,707,664 Ops/sec
Map Read	66,938 Ops/sec
Map Write	59,796 Ops/sec
Object Read	22,392 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) }