There is a tab filter. When switching tabs quickly, sometimes old values unrelated to the current tab are shown. What is the reason and how to fix it?

The reason for old values appearing when quickly switching tabs is due to asynchronous requests that return data not in the order they were sent. For example, a request for tab 1 arrived later than for tab 2, but updates the state, overwriting data.

How to fix:

• Cancel previous requests when switching tabs (if using the fetch API, you can use AbortController).
• Use unique request identifiers and update the state only if the response corresponds to the current active tab.
• Apply local state for each tab so that data is not overwritten.

Example with AbortController:

let controller = null;

function fetchData(tabId) {
  if (controller) {
    controller.abort();
  }
  controller = new AbortController();
  fetch(`/data?tab=${tabId}`, { signal: controller.signal })
    .then(response => response.json())
    .then(data => {
      if (currentTab === tabId) {
        updateUI(data);
      }
    })
    .catch(err => {
      if (err.name !== 'AbortError') {
        console.error(err);
      }
    });
}

This approach guarantees that outdated requests do not affect the displayed data.