Run results for: Map vs Object (Lookup then delete keys) Performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
Conspicuous Map lookup & delete	2438.3 Ops/sec
Conspicuous Obj lookup & delete	130.9 Ops/sec

Script Preparation code:

var keyCount = 16384
var keys = []
var map = new Map()
var obj = {}


// 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 & delete
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) if (a) map.delete(key) }
Conspicuous Obj lookup & delete
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] if (a) delete obj[key] }

Run results for: Map vs Object (Lookup then delete keys) Performance

Lookup of map vs object then delete keys

Conspicuous Map lookup & delete

Conspicuous Obj lookup & delete