How to remove duplicates in map()

Question

How to remove duplicates in [].map() . a.href may contain the same href link, how can I stop this reoccuring data? EXAMPLE: www.example.com | www.example.com

const hrefs = await page.evaluate(() => {
    const anchors = document.querySelectorAll('a');
    return [].map.call(anchors, a => a.href);
});

Answer 1

Set hrefs = new Set([].map.call(anchors, a => a.href));
return [...hrefs];