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Assume that productData is an array of products like this:

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const productData = [
  { name: 'Product A', price: 20 },
  { name: 'Product B', price: 10 },
  { name: 'Product C', price: 15 },
];
If we want to sort this array by price, we can use the sort() method of arrays like this:

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productData.sort((a, b) => a.price - b.price);
This would sort the productData array in place, which means that the original array is modified. After sorting, productData would look like this:

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[
  { name: 'Product B', price: 10 },
  { name: 'Product C', price: 15 },
  { name: 'Product A', price: 20 },
]
However, this is not safe to do with state variables in React. If we modify the state variable directly, React may not know that the state has changed and it may not trigger a re-render.

To avoid this issue, we need to create a new array with the sorted data and update the state with it. We can create a new array by using the spread operator like this:

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const sortedProducts = [...productData].sort((a, b) => a.price - b.price);
This creates a new array (sortedProducts) that has the same elements as the original array (productData). We can then safely sort the new array without affecting the original array.

Finally, we can update the state with the sorted array using the setProductData function like this:

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setProductData(sortedProducts);
This will update the state with the new array and trigger a re-render.

In summary, spreading the productData array creates a new array that has the same elements as the original array. This new array can then be sorted safely without affecting the original array, and we can update the state with the sorted array using the setProductData function.





himanshukesarwani700@gmail.com
so we do this for triggering re render right?
Yes, we create a new sorted array using the spread operator ... to trigger a re-render in React. When we set the state of a component using the useState hook in React, we should never modify the state variable directly. Instead, we should always create a new state with the updated value and then use the setProductData function to update the state with the new value.

By creating a new sorted array using the spread operator, we ensure that the original array productData is not modified directly. This is important because directly modifying the state variable can lead to unpredictable behavior and cause issues in the component's rendering.

When we use the setProductData function to update the state with the new sorted array, React recognizes that the state has changed and triggers a re-render of the component, updating the UI with the new sorted data.

Therefore, by creating a new sorted array and updating the state with it, we ensure that the component re-renders with the updated data, and the UI is updated accordingly.