Benchmark: Object.keys().length vs Map.size

Script Preparation code:

var data = new Array(100000).fill(undefined).map((_,i) => i)
var obj = data.reduce((obj, idx) => {obj['idx' + idx] = idx; return obj}, {});
var map = new Map(Object.entries(obj));

Tests:

Object.keys().length
var size = Object.keys(obj).length
Map.size
var size = map.length

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.keys().length
Map.size

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0

Browser/OS: Firefox 102 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Object.keys().length	877.3 Ops/sec
Map.size	868779100.0 Ops/sec

Object.keys().length vs Map.size (version: 0)

Comparing performance of: Object.keys().length vs Map.size

Created: one year ago by: Registered User

Jump to the latest result

Object.keys().length

Map.size

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A