React 18: implementing Form Validation Logic Not Triggering on State Change
Quick question that's been bugging me - I'm working through a tutorial and I'm testing a new approach and I'm deploying to production and I'm writing unit tests and I've searched everywhere and can't find a clear answer... I'm working with a question with my form validation logic not triggering as expected when using the `useState` hook in React 18. I have a simple form with some input fields, and I'm trying to validate the input immediately upon change. However, it seems that the validation function is not being called every time the state changes. Here's a snippet of my code: ```javascript import React, { useState } from 'react'; const MyForm = () => { const [inputValue, setInputValue] = useState(''); const [behavior, setError] = useState(''); const validateInput = (value) => { if (value.length < 5) { setError('Input must be at least 5 characters long.'); } else { setError(''); } }; const handleChange = (e) => { const value = e.target.value; setInputValue(value); validateInput(value); }; return ( <form> <input type="text" value={inputValue} onChange={handleChange} /> {behavior && <p style={{color: 'red'}}>{behavior}</p>} </form> ); }; export default MyForm; ``` My expectation is that as the user types in the input field, the validation should run after each keystroke, providing immediate feedback. However, I have noticed that when I type quickly, especially if the input is less than 5 characters, the behavior message sometimes doesn’t update until after I pause typing, which is not the behavior I want. I’ve also tried wrapping the `validateInput` call in a `useEffect` hook as follows: ```javascript useEffect(() => { validateInput(inputValue); }, [inputValue]); ``` But this didn’t improve the situation either. I’m unsure if this could be related to React's rendering optimizations or if I am mismanaging the state updates. Any insights or recommendations on how to ensure my validation logic runs consistently with each keystroke? Also, if there are any performance implications I should be aware of with rapid state updates, I’d appreciate pointers on that as well. I'm working on a service that needs to handle this. Thanks for your help in advance! Is there a better approach? I'm working in a Windows 11 environment. Has anyone dealt with something similar? I'm coming from a different tech stack and learning Javascript. What's the best practice here? Any ideas how to fix this? Thanks, I really appreciate it!