Run results for: map Vs object vs array3

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
map test for merge	5328987.0 Ops/sec
map.values()	18388510.0 Ops/sec
object merge	1668589.0 Ops/sec
object values	3669244.0 Ops/sec
array merge	6506261.0 Ops/sec

Script Preparation code:

var map1 = new Map();
map1.set('a1', 1);
map1.set('b1', 2);
map1.set('c1', 3);
map1.set('d1', 4);
map1.set('a', 5);
var map2 = new Map();
map2.set('a2', 1);
map2.set('b2', 2);
map2.set('c2', 3);
map2.set('d2', 4);
map2.set('a', 5);

var obj1 = {
    'a1': 1,
    'b1': 2,
    'c1': 3,
    'd1': 4
};
var obj2 = {
    'a2': 1,
    'b2': 2,
    'c2': 3,
    'd2': 4
};

var arr1 = [1, 2, 3, 4];
var arr2 = [5, 6, 7, 8];

Tests:

map test for merge
const items =[...map1.values(), ...map2.values(),]
map.values()
const items = map1.values();
object merge
const items = [...Object.values(obj1), ...Object.values(obj2),]
object values
const items =Object.values(obj1)
array merge
const items =[...arr1, ...arr2,]

Run results for: map Vs object vs array3

map test for merge

map.values()

object merge

object values

array merge