Run results for: uniq objects array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Set and ForOf

6K/s

Map

5K/s

View exact numbers

Test name	Executions per second
✓ Set and ForOf	6,114 Ops/sec
Map	4,732 Ops/sec

Script Preparation code:

function generateRandomObjects(count) {
    const getRandomString = (length = 5) =>
        Math.random().toString(36).substring(2, 2 + length);

    return Array.from({
        length: count
    }, () => ({
        item: getRandomString(),
        descr: getRandomString(),
    }));
}

// Пример использования:
const randomObjects = generateRandomObjects(3000);
console.log(randomObjects);

Tests:

Set and ForOf
const uniqItems = new Set(); const items = []; for (const element of randomObjects) { const key = `${element.item} - ${element.descr}`; if (!uniqItems.has(key)) { items.push(element); uniqItems.add(key); } }
Map
const items = Array.from( new Map( randomObjects.map(i => [`${i.item} - ${i.descr}`, { item: i.item, descr: i.descr }]) ).values() );