Run results for: Set vs array.includes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

array.includes

47K/s

new Set(...)

20K/s

View exact numbers

Test name	Executions per second
✓ array.includes	47,255 Ops/sec
new Set(...)	19,697 Ops/sec

Tests:

new Set(...)
const strings = ['russia', 'usa', 'russia', 'france', 'russia', 'spain']; let result = []; for(let i = 0; i < 100; ++i) { const cities = strings.reduce((acc, item) => { return [...acc, item]; }, []); [...new Set(cities)]; }
array.includes
const strings = ['russia', 'usa', 'russia', 'france', 'russia', 'spain']; for(let i = 0; i < 100; ++i) { const cities = strings.reduce((acc, item) => { if (!acc.includes(item)) { return [...acc, item]; } return acc; }, []); }