Run results for: Map vs Object (real-world) Performance (lookup and set)

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/129.0.6668.69 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 129

Operating system: iOS 17.6

Device Platform: Mobile

Date tested: one year ago

Conspicuous Map Set

263/s

Conspicuous Map lookup

209/s

Conspicuous Map lookup 2

198/s

Conspicuous Obj Set

175/s

Conspicuous Obj lookup 2

151/s

Conspicuous Obj lookup

143/s

View exact numbers

Test name	Executions per second
✓ Conspicuous Map Set	263 Ops/sec
Conspicuous Map lookup	209 Ops/sec
Conspicuous Map lookup 2	198 Ops/sec
Conspicuous Obj Set	175 Ops/sec
Conspicuous Obj lookup 2	151 Ops/sec
Conspicuous Obj lookup	143 Ops/sec

Script Preparation code:

var keyCount = 16384
var keys = []
var map = new Map()
var obj = {}
var emptyMap = new Map()
var emptyObj = {}


// 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(key)
  map.set(key,val)
  obj[key] = val
}

Tests:

Conspicuous Map lookup
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) }
Conspicuous Obj lookup
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] }
Conspicuous Map lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) }
Conspicuous Obj lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] }
Conspicuous Map Set
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) emptyMap.set(key, seed) }
Conspicuous Obj Set
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) emptyObj[key] = seed }