FAQ: The Effect Hook - Function Component Effects

This community-built FAQ covers the “Function Component Effects” exercise from the lesson “The Effect Hook”.

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FAQs on the exercise Function Component Effects

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Does it matter where you call useEffect()? The lesson said to put it in a certain place. Not sure if that’s for the sake of the code testing.


Hello. I’m also wondering if we need to put useEffect() at a certain place…

I 'm wondering why also!!

useEffect( ) still works the same if you put it in a certain place, but you must always put useEffect( ) before the return keyword. Here are some rules of Hooks you need to know in React: https://reactjs.org/docs/hooks-rules.html

@alvinyang5036814935 @chip5010245305

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calling useEffect() after handleClick doesn’t violate any rules as per the ‘docs’, but the test does flag that as an error.
there may be some other reason for that…


Why does the test fail if I put the code this way even though the code functions as it suppose to.

useEffect(() => alert(Count: ${count}));

But the tests passes with this:

useEffect(()=> {alert(Count: ${count})});

This is a really simple question and im probably forgetting a basic concept somewhere but how come for question 2 of this exercise,
doesnt work…and you have to put alert in curly brackets?

Is it because alert() is a javascript function and anything returned from a javascript function must be within curly brackets? I think I read that somewhere but I cant really remember for sure.
And if that’s the case shouldnt we be putting a curly bracket around the entire arrow function? Like:
since the arrow function is a javascript function.