React hook: difference between setting the state with an argument or an arrow function

Question

I would like to expand on the state update in the following issue

React Hooks, rerender & keeping same state - how it works underhood?

Is there a difference between the two ways of updating {count} ? Are they strictly equivalent ?

<button onClick={()=>setCount**(count+1)**} >{count}</button>

<button onClick={()=>setCount(**savedCount => savedCount+1)**}{count}</button>

Thanks in advance

Answer 1

No they are not. You should prefer the latest, since it guarantees that the count your are working with is the latest version. When working directly with count rather than savedCount, it could have some updates still not applied.