Run results for: Map vs Object (real-world) Performance (non-numeric key)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser: Chrome 127

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Conspicuous Obj get miss

721/s

Conspicuous Map get miss

702/s

Conspicuous Obj set

694/s

Conspicuous Map set

607/s

Conspicuous Obj lookup

417/s

Conspicuous Map lookup

390/s

View exact numbers

Test name	Executions per second
✓ Conspicuous Obj get miss	721 Ops/sec
Conspicuous Map get miss	702 Ops/sec
Conspicuous Obj set	694 Ops/sec
Conspicuous Map set	607 Ops/sec
Conspicuous Obj lookup	417 Ops/sec
Conspicuous Map lookup	390 Ops/sec

Script Preparation code:

var keyCount = 16384
var keys = []
var map = new Map()
var obj = {}
var accessKeys = [];


// Hide lookup keys to prevent V8 cheating (AKA Optimizing)
var getConspicuousKey = seed => keys[Math.floor(seed * keyCount)]


// Setup out test objects w/ random values
for (let i=0; i<keyCount; i++) {
  let val = Math.random()
  let key = Math.random()
  keys.push('x' + key)
  map.set(key,val)
  obj[key] = val
}

var conspicuousKeys = keys.map(() => getConspicuousKey(Math.random()))
var a = null

Tests:

Conspicuous Map lookup
for (let i=0; i<keyCount; i++) { a = map.get(conspicuousKeys[i]) }
Conspicuous Obj lookup
for (let i=0; i<keyCount; i++) { a = obj[conspicuousKeys[i]] }
Conspicuous Map set
var mapX = new Map(); for (let i=0; i<keyCount; i++) { mapX.set(conspicuousKeys[i], 0) }
Conspicuous Obj set
var objX = {}; for (let i=0; i<keyCount; i++) { objX[conspicuousKeys[i]] = 0 }
Conspicuous Map get miss
for (let i=0; i<keyCount; i++) { a = map.get('not-existed') }
Conspicuous Obj get miss
for (let i=0; i<keyCount; i++) { a = obj['not-existed'] }