Run results for: set.has vs. array.includes large array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser: Chrome 127

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

lookup

2.2M/s

includes

1K/s

View exact numbers

Test name	Executions per second
✓ lookup	2,238,842 Ops/sec
includes	1,089 Ops/sec

Script Preparation code:

const NUM_ITEMS = 1000000;
var a = [];
for(let i = 1; i < NUM_ITEMS; i++) {
  a.push(i);
}
var b = new Set(a)

Tests:

includes
const NUM_ITEMS = 1000000; return a.includes(Math.random() * NUM_ITEMS)
lookup
const NUM_ITEMS = 1000000; return b.has(Math.random() * NUM_ITEMS)