Show the total price per person of an Airbnb listing

airbnb-price-per-person.js

// Script that shows the total price of an Airbnb listing divided by the number of persons
// Inject it in any Airbnb search page (https://airbnb.com/s/*)

!function() {
  function runner() {
    const persons = +new URL(window.location.href).searchParams.get('adults');

    if (!persons) {
      return;
    }

    const $prices = [...document.querySelectorAll('button > div > div > span[aria-hidden=true]')];
    const sep = `—`

    for (const $price of $prices) {
      const [initialStr] = $price.textContent.split(sep);
      const price = +initialStr.replace(/\D/g,'');
      const pricePerPerson = Math.round(price / persons * 100) / 100;

      $price.textContent = `${initialStr} ${sep} ${pricePerPerson}/pers`
    }
  }

  setInterval(runner, 1000);
}()