Benchmark: Object iteration vs Map iteration with lambda functions

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; for (const [key, value] of map) { total += value; }
Map - forEach
let total = 0; map.forEach(value => { total += value; });
Object.entries() - for of kv
let total = 0; for (const [key, value] of Object.entries(obj)) { total += value; }
Object.entries() - forEach
let total = 0; Object.entries(obj).forEach(value => { total += value; });
Object - for in
let total = 0; for (const key in obj) { total += obj[key]; }
repeat first test
let total = 0; for (const [key, value] of map) { total += value; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map - for of kv
Map - forEach
Object.entries() - for of kv
Object.entries() - forEach
Object - for in
repeat first test

Fastest: N/A

Slowest: N/A

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Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36

Browser/OS: Chrome 106 on Windows

View result in a separate tab

Test name	Executions per second
Map - for of kv	3897828.0 Ops/sec
Map - forEach	3170664.0 Ops/sec
Object.entries() - for of kv	754139.1 Ops/sec
Object.entries() - forEach	138760.9 Ops/sec
Object - for in	447877.6 Ops/sec
repeat first test	4206006.0 Ops/sec

Object iteration vs Map iteration with lambda functions (version: 0)

Comparing performance of: Map - for of kv vs Map - forEach vs Object.entries() - for of kv vs Object.entries() - forEach vs Object - for in vs repeat first test

Created: one year ago by: Guest

Jump to the latest result

Map - for of kv

Map - forEach

Object.entries() - for of kv

Object.entries() - forEach

Object - for in

repeat first test

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A