Run results for: Map vs Object (real-world) Performance with string keys

Run details:

User agent: Mozilla/5.0 (Linux; arm_64; Android 15; Pixel 6a) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.6723.100 YaBrowser/24.12.3.100.00 SA/3 Mobile Safari/537.36

Browser: Yandex Browser 24

Operating system: Android

Device Platform: Mobile

Date tested: 3 months ago

Test name	Executions per second
Conspicuous Map lookup	207.1 Ops/sec
Conspicuous Obj lookup	227.8 Ops/sec
Conspicuous Map lookup 2	222.1 Ops/sec
Conspicuous Obj lookup 2	227.7 Ops/sec

Script Preparation code:

var keyCount = 16384
var keys = []
var map = new Map()
var obj = {}
var result = 0


// 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) let val = map.get(key) result += +val[1] > 5 ? 1 : -1 }
Conspicuous Obj lookup
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) let val = obj[key] result += +val[1] > 5 ? 1 : -1 }
Conspicuous Map lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) let val = map.get(key) result += +val[1] > 5 ? 1 : -1 }
Conspicuous Obj lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) let val = obj[key] result += +val[1] > 5 ? 1 : -1 }

Run results for: Map vs Object (real-world) Performance with string keys

Lookup of map vs object (in a real-world test format)

Conspicuous Map lookup

Conspicuous Obj lookup

Conspicuous Map lookup 2

Conspicuous Obj lookup 2