How can the problem of race condition be solved when switching users (when multiple requests are sent in a row)? What approaches can be used: AbortController, debounce, disabling buttons through loading state?

Race condition issues when switching users occur when multiple requests are sent consecutively, and the result of the last one can be unpredictable. Several approaches can be used to solve this:

• AbortController — allows canceling previous requests if a new one is sent. This prevents processing outdated responses.

const controller = new AbortController();

function fetchData() {
  controller.abort(); // cancel previous request
  controller = new AbortController();
  fetch('/api/data', { signal: controller.signal })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(err => {
      if (err.name === 'AbortError') {
        console.log('Request canceled');
      }
    });
}

• Debounce — delays the execution of a function until rapid repeated calls stop. This reduces the number of requests.

• Disabling buttons via loading state — prevents repeated clicks until the previous request completes.

These methods are often combined for reliable request control and improved UX.