Run results for: Object iteration vs Map iteration

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; moto g(6) play) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.85 Mobile Safari/537.36

Browser: Chrome Mobile 94

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Map - for of kv	259762.4 Ops/sec
Map - forEach	202829.9 Ops/sec
Object.entries() - for of kv	50165.9 Ops/sec
Object.entries() - forEach	10420.7 Ops/sec
Object - for in	37717.1 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));

Tests:

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

Run results for: Object iteration vs Map iteration

Map - for of kv

Map - forEach

Object.entries() - for of kv

Object.entries() - forEach

Object - for in