React useEffect Hooks with setTimeout

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I am so confused here with React useEffect Hooks with setTimeout. I have exactly the same code as w3school https://www.w3schools.com/react/showreact.asp?filename=demo2_react_useeffect_settimeout2

but my code is rendering "I've rendered 2 times" instead of "I've rendered 1 time". And I have tried it in many code editors, and mine always shows 2..

My: enter image description here

And the only way I can get it to render 1 is refactoring to this instead

useEffect(() => {
     setTimeout(() => {
     setCount(count + 1);
   }, 1000);
 }, []); 

Could someone please explain to me why? Thanks for your help!

I am expecting my code to render the same result as the w3school example.

Jan 27, 2023 in Others by Tejashwini
• 3,820 points
600 views

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