Run results for: Map vs Object: Lookup, insert and delete

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/110.0

Browser: Firefox 110

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Map operations	5121.6 Ops/sec
Obj operations	7769.0 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};
var i = 0, count = 1000, a;

function getOnMap(uid) {
  if (map.has(uid)) {
    return map.get(uid);
  }
  let storage = {};
  map.set(uid, storage);
  return storage;
}

function getOnObj(uid) {
  let storage = obj[uid];
  if (!storage) {
    storage = obj[uid] = {};
  }
  return storage;
}

Tests:

Map operations
for (i = 0; i < count; i++) { a = getOnMap(i); map.delete(i); }
Obj operations
for (i = 0; i < count; i++) { a = getOnObj(i); delete obj[i]; }

Run results for: Map vs Object: Lookup, insert and delete

Map operations

Obj operations