useEffect is a powerful tool, but you need to use it with a clear understanding of how it works. Otherwise, you could en

By reassigning it inside the async code, we are replacing the reference. It’s about a racing condition, therefore sometimes it might not occurs, that’s why it’s tricky, but it’s not secure at all.

The first mistake I would like to talk about is that useEffect expect you to return undefined or a cleanup function. But if you use anasync function you’re in fact returning a Promise (and sometimes a promise that resolve to a function) where a function is expected, this explains why your cleanup is not working.

function dummySubscriber(callback) { const interval = setInterval(() => callback('ticked'), 1000); return function unSubscribe() { clearInterval(interval); }; }

28. If someone always feels the need to correct you, and never agrees with you instinctively, believe that they are actually very threatened by you, and need to assert dominance.

21. When people don’t show up for you — especially for significant times and events — believe that they are more invested in the idea of your relationship than you as a person. Everyone says they care — the people who show up are the ones who actually do.

30. If someone tells you that there’s a certain relationship or friendship pattern that “always” happens to them (i.e. they are “always” friend-zoned, or they “always” lose their BFFs) believe that it’s a warning.

26. If someone defends their harsh or hurtful opinions by saying they are “just being honest,” believe that they either lack a decent amount of empathy, or tact in communicating.

25. If someone seems like a nice person to your face but aggressive and different behind a screen, believe that the latter is more of who they really are, they’re just in a position where they’re not afraid to show it.

Also remember that even if using asynchronous code, the effect is just triggered in « fire and forget » mode, without waiting for your asynchronous code. Doing otherwise there would have been disastrous UI repercussions.

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o feel lost having to choose amongst all this different content, it cannot be otherwise, there are many branches of development and every person will choose which one to pursue based on its interest, but isn’t there some essential material that every self-learner should go through anyway?

The easiest way to achieve an infinite loop with useEffect is to trigger the effect when some state changes, and when this state changes, you run some code that triggers this same state change.

31. If someone is willing to let go of past grievances and start new in your relationship, believe them, because it is far easier to walk away than it is to change for the sake of someone else’s happiness.

Now when the return function is generated, it keeps a reference to the object whose property current or unsubscribe in the above example is updated. That way our clean function is properly called.

29. If someone makes you feel weird for no explicable reason after you’re together for a period of time, believe your instinct, and trust that they are grating on you in ways you may not be aware of.

24. If someone promises you they will change so that you won’t be mad at them anymore but doesn’t actually do it, believe that they are not going to until they are ready — on their own terms.