Run results for: Set.has v.s Array.includes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36 Edg/140.0.0.0

Browser: Chrome 140

Operating system: Windows

Device Platform: Desktop

Date tested: 10 months ago

Benchmark engine: Benchmark.js

array

2.8M/s

set

502K/s

View exact numbers

Test name	Executions per second
✓ array	2,751,278 Ops/sec
set	502,177 Ops/sec

Script Preparation code:

function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

function createRandomIntArray(minLength, maxLength) {
    const length = getRandomInt(minLength, maxLength);
    const randomArray = [];

    for (let i = 0; i < length; i++) {
        const randomInt = i;
        randomArray.push(getRandomInt(0, maxLength));
    }

    return randomArray;
}

const minLength = 1;
const maxLength = 100;

var ids1 = createRandomIntArray(minLength, maxLength);
var ids2 = createRandomIntArray(minLength, maxLength);
var ids3 = createRandomIntArray(minLength, maxLength);

var target1 = createRandomIntArray(1, 50);
var target2 = createRandomIntArray(1, 50);
var target3 = createRandomIntArray(1, 50);

Tests:

set
var idsSet1 = new Set(ids1) target1.some(id => idsSet1.has(id)) var idsSet2 = new Set(ids2) target2.some(id => idsSet2.has(id)) var idsSet3 = new Set(ids3) target3.some(id => idsSet3.has(id))
array
target1.some(id => ids1.includes(id)) target2.some(id => ids2.includes(id)) target3.some(id => ids3.includes(id))