ReactJS - Handling complex form state with dynamic fields and preventing unnecessary re-renders
I tried several approaches but none seem to work... I'm building a dynamic form in React where users can add or remove fields based on their input... However, I'm running into performance optimization when the form has many fields. Specifically, when I update the state of one input, the entire form seems to re-render, causing lag in typing and input handling. I'm using React 17 and functional components along with hooks. Currently, my form state looks like this: ```javascript const [formFields, setFormFields] = useState([{ id: Date.now(), value: '' }]); ``` I add new fields using a function like this: ```javascript const addField = () => { setFormFields([...formFields, { id: Date.now(), value: '' }]); }; ``` Each input is rendered like this: ```javascript {formFields.map((field, index) => ( <input key={field.id} type="text" value={field.value} onChange={(e) => handleChange(index, e)} /> ))} ``` The `handleChange` function updates the specific field: ```javascript const handleChange = (index, event) => { const newFields = [...formFields]; newFields[index].value = event.target.value; setFormFields(newFields); }; ``` The question arises when I try to type in one of the fields—the entire form re-renders, causing a noticeable delay. I suspect that using the spread operator on `formFields` in `handleChange` is the culprit, but I'm not sure how to handle it without compromising the immutability of the state. I've tried using `useMemo` to memoize the rendered inputs, but it didn’t seem to help. Is there a better way to manage the state of these dynamic fields without causing unnecessary re-renders? Should I implement individual state for each field instead, or is there a more efficient approach using hooks? I'm using Javascript stable in this project. Am I approaching this the right way?