Run results for: Object iteration vs Map iteration 123

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:138.0) Gecko/138.0 Firefox/138.0

Browser: Firefox Mobile 138

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

array

2.9M/s

map

2.8M/s

View exact numbers

Test name	Executions per second
✓ array	2,943,494 Ops/sec
map	2,844,834 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 = Object.values(obj);

Tests:

array
let a = 0; arr.forEach((v) => { a += v; });
map
let a = 0; map.forEach((v, k) => { a += v; });