Run results for: Object iteration vs Map iteration 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser: Chrome 116

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
array.forEach	2294832.2 Ops/sec
map.forEach	4476068.0 Ops/sec
object for	700963.2 Ops/sec

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));

var arr = new Array(Object.values(obj));

Tests:

array.forEach
let a = 0; arr.forEach((v) => { a += v; });
map.forEach
let a = 0; map.forEach((v, k) => { a += v; });
object for
let a = 0; for(const k in obj){ a += obj[k]; }

Run results for: Object iteration vs Map iteration 2

array.forEach

map.forEach

object for