TypeError When Trying to Access Function Arguments in Nested Callback with React 18
I'm wondering if anyone has experience with I've been struggling with this for a few days now and could really use some help. This might be a silly question, but I'm working with a `TypeError: want to read properties of undefined` when trying to access arguments from a function within a nested callback in my React 18 application... I have a component that uses a button to trigger an asynchronous action, and I am trying to use the `setState` function with some data returned from that action. Here's a simplified version of my code: ```javascript import React, { useState } from 'react'; const MyComponent = () => { const [data, setData] = useState(null); const fetchData = async (arg) => { const response = await fetch(`https://api.example.com/data/${arg}`); const result = await response.json(); return result; }; const handleClick = (arg) => { fetchData(arg).then((result) => { // This line is causing the scenario setData(result.data); // TypeError happens here }); }; return <button onClick={() => handleClick('123')}>Fetch Data</button>; }; export default MyComponent; ``` I have confirmed that the `fetchData` function is executing correctly and returning the expected result. However, the `result` object seems to cause an scenario when trying to access `result.data`. I added some console logs, and I can see that `result` is an object, but sometimes it seems to be `undefined` due to how the promise resolves under certain conditions. I've also verified that `fetchData` is always called with a valid argument. How can I ensure that `result` is defined when I try to access `result.data`, and what best practices should I follow to handle this type of asynchronous behavior in React? I've tried adding some behavior handling, but I'm not sure how to integrate it correctly without making the component overly complex. Any help would be greatly appreciated! Am I approaching this the right way?