Run results for: Map vs Object (3)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Browser: Chrome 102

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Map get	27.0 Ops/sec
Obj get	22.7 Ops/sec
Map set	24.5 Ops/sec
Obj set	17.8 Ops/sec
Map get after all	11.7 Ops/sec
Obj get after all	10.3 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};

var i = 0,
    count = 100000,
    a;

function getKey(i) {
    return `i-${i}`;
}

// set default values
for (i = 0; i < count; i++) {
    var key = getKey(i);
    var value = {
        i,
        key
    };
    map.set(key, value);
    obj[key] = value;
}

Tests:

Map get
for (i = 0; i < count; i++) { a = map.get(getKey(i)); }
Obj get
for (i = 0; i < count; i++) { a = obj[getKey(i)]; }
Map set
for (i = 0; i < count; i++) { var value = { i, key }; map.set(getKey(i + count), value); }
Obj set
for (i = 0; i < count; i++) { var value = { i, key }; obj[getKey(i + count)] = value; }
Map get after all
for (i = 0; i < count * 2; i++) { a = map.get(getKey(i)); }
Obj get after all
for (i = 0; i < count * 2; i++) { a = obj[getKey(i)]; }

Run results for: Map vs Object (3)

Lookup of map vs object

Map get

Obj get

Map set

Obj set

Map get after all

Obj get after all