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How to Properly Set Multiple States Inside Multiple useEffect Hooks in React 📌[All Method]️

Richard ParkerFebruary 8, 2022

1 minute read

How to Properly Set Multiple States Inside Multiple useEffect Hooks in React 📌[All Method]️ — How to Properly Set Multiple States Inside Multiple useEffect Hooks in React All Method

The blog will help about How to Properly Set Multiple States Inside Multiple useEffect Hooks in React & learn how to solve different problems that come from coding errors. By following this guide, you will be able to deal with these sorts of difficulties.
Question: What is the best way to approach this problem? Answer: Check out this blog code to learn how to fix errors How to Properly Set Multiple States Inside Multiple useEffect Hooks in React. Question: What are the reasons for this code mistake and how can it be fixed? Answer: You can find a solution by following the advice in this blog.

Suppose we have a state that we’ve initialized using useState().

const [ count, setCount ] = useState({
  a: 0,
  b: 0
});

Suppose we want to update multiple attributes inside count using different useEffect() hooks.

We might think to write it this way.

useEffect(() => {
  setCount({ ...count, a: props.a });
}, [props.a]);

useEffect(() => {
  setCount({ ...count, b: props.b });
}, [props.b]);

The problem with this approach is that a may never be updated.

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Both useEffect() hooks run in the same React cycle and the same context. This means that the value of a and b inside ...count is exactly the same in both useEffect() hooks. The second setCount() will inevitably replace the first setCount().

In order to solve this problem, we can do this instead:

useEffect(() => {
  setCount((count) => ({ ...count, a: props.a }));
}, [props.a]);

useEffect(() => {
  setCount((count) => ({ ...count, b: props.b }));
}, [props.b]);

After each setCount(), we will receive the most updated value of count.

Now you learned, How you can use & How to Properly Set Multiple States Inside Multiple useEffect Hooks in React.
If you need assistance at any stage, please feel free to contact me.