React JS Tutorial – 10 – useState With Array

React JS is a popular JavaScript library used for building user interfaces. One of the key features of React is the ability to manage state within a component. This allows for dynamic updates to the user interface based on changes in the application’s data.

In this tutorial, we will explore how to use the useState hook with arrays in React. The useState hook is a feature introduced in React 16.8 that allows functional components to manage state without needing to use class components or lifecycle methods.

Let’s start by creating a simple React component that uses the useState hook to manage an array of items:

```javascript
import React, { useState } from 'react';

function ItemList() {
  const [items, setItems] = useState([]);

  const addItem = () => {
    setItems([...items, `Item ${items.length + 1}`]);
  }

  return (
    

      Add Item
      

        {items.map((item, index) => (
          
{item}
        ))}
      
    
  );
}

export default ItemList;
```

In this example, we have created a functional component called ItemList. Inside the component, we use the useState hook to initialize a state variable called items, which is an empty array. We also use the setItems function to update the state with a new array containing the existing items plus a new item when the “Add Item” button is clicked.

By using the useState hook with arrays, we can easily manage and update the state of an array within a React component. This allows for dynamic rendering of items based on changes to the array, providing a more interactive user experience.

As you can see, useState with arrays is a powerful feature in React that can be used to create dynamic and interactive user interfaces. By understanding how to use the useState hook with arrays, you can effectively manage state within your React components and build more sophisticated applications.

Thank you for reading this tutorial on how to use useState with arrays in React. We hope you found it helpful and look forward to seeing what you create using this feature!