Benchmark: map vs obj filling and accessing (string as key)

Script Preparation code:

const data = new Array(1000000)
	.fill(1)
	.map((item) => "somekeeeey-" + String(Math.floor(Math.random() * 10000)))

const map1 = new Map();
const map2 = {}

Tests:

Filling map
data.forEach((item) => { map1.set(item, { id: item, rand: Math.random() }); });
Filling object
data.forEach((item) => { map2[item] = { id: item, rand: Math.random() }; });
Accessing map
const aggr = [] data.forEach((item) => { aggr.push(map1.get(item)) });
Accessing object
const aggr = [] data.forEach((item) => { aggr.push(map2[item]); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Filling map
Filling object
Accessing map
Accessing object

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Browser/OS: Chrome 145 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Filling map	32.0 Ops/sec
Filling object	45.6 Ops/sec
Accessing map	35.7 Ops/sec
Accessing object	19.4 Ops/sec

Related benchmarks:

map vs obj filling and accessing (string as key) (version: 1)

Comparing performance of: Filling map vs Filling object vs Accessing map vs Accessing object

Created: 3 months ago by: Guest

Jump to the latest result

Filling map

Filling object

Accessing map

Accessing object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A