Run results for: Map vs Object add - lookup - delete

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0

Browser: Firefox 75

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Map	1276.9 Ops/sec
Obj	1691.3 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};

map.set('a', 5);
obj['a'] = 5;

var i = 0, count = 1000, a;

Tests:

Map
for (i = 0; i < count; i++) { a = map.get('a'); map.delete('a'); map.set('a', 5); }
Obj
for (i = 0; i < count; i++) { a = obj['a']; delete obj['a']; obj['a'] = 5; }