Run results for: Map vs Object.entries

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

map for of

2.8M/s

map forEach

2.0M/s

Object.entries for of

535K/s

View exact numbers

Test name	Executions per second
✓ map for of	2,842,814 Ops/sec
map forEach	1,999,169 Ops/sec
Object.entries for of	534,745 Ops/sec

Script Preparation code:

var obj = {
    1: "ASDASDASDASD",
    2: "ASDASDASDASDASDA",
    3: "ASDASDASDASDAAA",
    4: 5242,
    5: "AAAAAA",
    6: "asdasdasdasd",
    7: [24342343, "sweet", "hello"],
    8: [1, 2, 3, 4],
    9: [1, 2, 3, 4, 5],
    10: "AAA",
    11: 5545,
    12: "gutenTag"
}
var map = new Map(Object.entries(obj))

Tests:

map forEach
let total = 0 map.forEach((k, v) => { total += 1 })
map for of
let total = 0 for (const [key, val] of map){ total += 1 }
Object.entries for of
let total = 0 for (const [key, val] of Object.entries(obj)){ total += 1 }

Run results for: Map vs Object.entries

only on a small collection

map forEach

map for of

Object.entries for of