Benchmark: Map vs Object (real-world) Performance with string keys

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 }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Conspicuous Map lookup
Conspicuous Obj lookup
Conspicuous Map lookup 2
Conspicuous Obj lookup 2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Linux

View result in a separate tab

Test name	Executions per second
Conspicuous Map lookup	503.0 Ops/sec
Conspicuous Obj lookup	591.7 Ops/sec
Conspicuous Map lookup 2	503.6 Ops/sec
Conspicuous Obj lookup 2	594.4 Ops/sec

Related benchmarks:

Map vs Object (real-world) Performance with string keys (version: 2)

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

Comparing performance of: Conspicuous Map lookup vs Conspicuous Obj lookup vs Conspicuous Map lookup 2 vs Conspicuous Obj lookup 2

Created: one year ago by: Registered User

Jump to the latest result

Conspicuous Map lookup

Conspicuous Obj lookup

Conspicuous Map lookup 2

Conspicuous Obj lookup 2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A