8/28/2023 0 Comments 30 second then 10 second timerRussia’s recent actions contravene decades of commitments by Moscow. The possibility that the conflict could spin out of anyone’s control remains high. Also, Russia’s war on Ukraine has raised profound questions about how states interact, eroding norms of international conduct that underpin successful responses to a variety of global risks.Īnd worst of all, Russia’s thinly veiled threats to use nuclear weapons remind the world that escalation of the conflict-by accident, intention, or miscalculation-is a terrible risk. The war in Ukraine may enter a second horrifying year, with both sides convinced they can win. Ukraine’s sovereignty and broader European security arrangements that have largely held since the end of World War II are at stake. The Clock now stands at 90 seconds to midnight-the closest to global catastrophe it has ever been. Solution: add a callback function in useEffect hook to clear the interval in current scope so that only one setInterval() instance is running in the global environment at the same time.This year, the Science and Security Board of the Bulletin of the Atomic Scientists moves the hands of the Doomsday Clock forward, largely (though not exclusively) because of the mounting dangers of the war in Ukraine. Clear setInterval() in this scope to avoid duplicated countdown.Solution: add a dependency of counter in useEffect hook so that every time when the counter changes, a new setInterval() is called. Let setInterval() get triggered every time when component gets re-rendered.To overcome the issue mentioned above, we need to trigger the setInterval() in every single App() call with different counter value, just as illustrated below. Third Attempts, useEffect with cancelling interval But in fact, it is not freezed, it is being reset all the time but the value is ALWAYS 59. That's why the counter seems to be freezed at 59. In the global environment, there is only one setInterval() instance which contiguously set the counter to 59, causing new App() calls always get the state counter to be 59. Therefore, within the App() scope, only in the first time, the useEffect() is triggered and the setInterval() is within the first time App() scope with the property counter always equal to 60. The following illustration may make things clearer.īecause every time when the component is re-rendered, the App() function is called again. This counter is indeed not decreased because the setCounter hook essentially does not change the counter within THIS function. But setCounter() definitely has run, then why isn't the counter updated? getElementById ( " root " ) render (, rootElement ) Įnter fullscreen mode Exit fullscreen modeĪll the numbers printed out are 60, which means the counter itself has not been decreased at all. Import * as React from " react " import const rootElement = document.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |