Do you know how to fix the error: “The useState set method not reflecting a change immediately” quickly and effectively? This article will propose leading ways to deal with it. Now, we would like to invite you to discover more about this error below.

When does this error: “The useState set method not reflecting a change immediately” occur?

Suppose you are working with useState for the Post const.setPosts might establish the Post which is extracted from the API. When you run this program, the error: “The useState set method not reflecting a change immediately” appears.

const [posts, setPosts] = useState([]);
useEffect(() => {
    const myData = await axios({
      method: "post",
      url: "my_api_call",
    });
setPosts(myData.data);
}, []);

From the code above, we realize and come up with the main causes of this error such as

1. The current closure of the state variable

The main reason that led to this error is because of the available closure of the state variable. It is involved in the old value, and the state updates ask for a re-render to show the updated value. Next, while React re-renders the element, a new closure is made to reflect new updates.

2. Users do not implement the “useEffect hook”.

If you do not add the “useEffect hook”, this error will display on your computer screen. In the other words, it can not update your posts when they occur.

How to fix the error: “The useState set method not reflecting a change immediately”?

Approach 1: Try a temporary variable

In this case, if you are not capable of assigning value, we will highly recommend that you go with a temporary variable. Perhaps, your API might make you wait for a while and set the value.

The code below illustrates the solution to solve this error:

const [posts, setPosts] = useState([]);
useEffect(() => {
    const myData = await axios({
      method: "post",
      url: "my_api_call",
    });
    const newPosts = await myData.data; // Temp Variable with await
setPosts(newPosts);
}, []);

After running this code, your error is completely solved right away.

Approach 2: Get the “useEffect hook”

As for the second case, we advise you to get the “useEffect hook”. It is similar to “componentDidUpdate” and gradually this can update your posts. The code below will prove it.

useEffect(() => {
    // setPosts Here
}, [posts]);

Cool! We make sure that you can tackle this issue and the error: “The useState set method not reflecting a change immediately” will be eliminated.

Approach 3: Use the merge response

Another solution that you should know is merging response with initial data, and you can implement the callback syntax of state update with the particular spread syntax’s usage below

setPosts(prevPostsData=> ([...prevPostsData, ...newPostsData]));

As soon as merging your response, the error will be entirely solved.

Approach 4: Use React.useRef()

The final approach is using “React.useRef()” rather than “useEffect()”. Because the “React.useRef()” is beneficial for instant transformation in the React hook. 

Let’s run the code below.

const posts = React.useRef(null);
useEffect(() => {
   posts.current='values';
   console.log(posts.current)
}, [])

After running this code, you can realize that the error is tackled successfully. 

Conclusion

We believe that you have fixed the error: “The useState set method not reflecting a change immediately” easily after browsing this post. Last but not least, you can give us your feedback below if needed. Thank you!

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