Benchmark: Object iteration vs Map iteration with deep cloning

Script Preparation code:

var obj = {
  a: 1,
  b: 2,
  c: 3,
  d: 4,
  e: 5,
  f: 6,
  g: 7,
  h: 8,
  i: 9,
  j: 10,
  k: 11,
  l: 12,
  m: 13,
  n: 14,
  o: 15,
  p: 16,
  q: 17,
  r: 18,
  s: 19,
  t: 20,
  u: 21,
  v: 22,
  w: 23,
  x: 24,
  y: 25,
  z: 26
};
var map = new Map(Object.entries(obj));

Tests:

Map - for of kv
let total = 0; const newMap = new Map(map); for (const [key, value] of newMap) { total += value; }
Object.entries() - for of kv
let total = 0; const newObj = {...obj} for (const [key, value] of Object.entries(newObj)) { total += value; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map - for of kv
Object.entries() - for of kv

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: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Map - for of kv	825691.9 Ops/sec
Object.entries() - for of kv	1338234.0 Ops/sec

Object iteration vs Map iteration with deep cloning (version: 0)

Comparing performance of: Map - for of kv vs Object.entries() - for of kv

Created: 10 months ago by: Guest

Jump to the latest result

Map - for of kv

Object.entries() - for of kv

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A