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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Conspicuous Map Set

2K/s

Conspicuous Map lookup

706/s

Conspicuous Map lookup 2

706/s

Conspicuous Obj Set

661/s

Conspicuous Obj lookup

465/s

Conspicuous Obj lookup 2

465/s

View exact numbers

Test name	Executions per second
✓ Conspicuous Map Set	1,718 Ops/sec
Conspicuous Map lookup	706 Ops/sec
Conspicuous Map lookup 2	706 Ops/sec
Conspicuous Obj Set	661 Ops/sec
Conspicuous Obj lookup	465 Ops/sec
Conspicuous Obj lookup 2	465 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 }