How Do I Update States Onchange In An Array Of Object In React Hooks

React hooks provide developers with powerful tools to manage state in functional components. In this article, we will explore how to update states onchange in an array of objects using React hooks, specifically focusing on the useState hook.

Let's begin by setting up our React component with the initial state. To declare a state variable that holds an array of objects, we can use the useState hook like this:

const [items, setItems] = useState([
  { id: 1, name: 'Item 1' },
  { id: 2, name: 'Item 2' },
  { id: 3, name: 'Item 3' },
]);

In this example, we have an array of objects representing items, each with an `id` and a `name`. Next, we need to update the state when an item's name is changed. To achieve this, we can create a function that will handle the onchange event for the input field and update the state accordingly:

const handleChange = (id, newName) => {
  setItems(items.map(item =>
    item.id === id ? { ...item, name: newName } : item
  ));
};

In the `handleChange` function, we use the `map` method to iterate over the existing items array. For the item with the matching `id`, we create a new object with the updated `name`, while keeping the other properties unchanged. Finally, we call `setItems` with the updated array to trigger a re-render and reflect the changes on the UI.

Now, let's integrate this `handleChange` function into our component's JSX to render the list of items with input fields that can be edited:

return (
  <div>
    {items.map(item =&gt; (
      <div>
         handleChange(item.id, e.target.value)}
        /&gt;
      </div>
    ))}
  </div>
);

In the JSX code above, we map through the `items` array and render an input field for each item. When the input value changes, the `onChange` event is triggered, calling the `handleChange` function with the item's `id` and the new value.

By following these steps, you can efficiently update states on change in an array of objects using React hooks. This approach provides a clean and concise way to manage complex state structures in functional components.

Remember, React hooks offer a more streamlined and intuitive way to handle state in functional components, allowing you to focus on building robust applications without the complexity of class components. Experiment with these concepts and harness the full potential of React hooks in your projects!