Rsa97

if (requestInProgress) {
  return;
}
requestInProgress = true;
const data = await fetch(...);
// отображаем данные
requestInProgress = false;

Traditionally, and according to ECMAScript, all primitives and objects are loosely unequal to undefined and null

const USER = {VALUTE: 'usd'};
DATA.market_data.current_price[USER.VALUTE]

if (target.closest('.category-button')) {
  ...
}

document.querySelectorAll('.bottomONE, .bottomTWO');