How is the Push method used in React Hooks useState or what are its best practices

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Can you tell me  How is the Push method used in React Hooks (useState), or what are its best practices?
Feb 21 in Node-js by Nidhi
• 16,020 points
82 views

1 answer to this question.

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In React Hooks (useState), you cannot use .push() directly on a state array because it mutates the original array, which won’t trigger a re-render. Instead, you should use immutable updates by spreading the previous state into a new array.

Correct Way to Add Elements to an Array in useState

Use spread syntax (...) to create a new array instead of mutating the existing state.

Example: Adding Items to an Array (Best Practice)

import { useState } from "react";

const App = () => {

  const [items, setItems] = useState<number[]>([]); // State as an array

  const addItem = () => {

    setItems([...items, items.length + 1]); // Spread old items and add a new one

  };

  return (

    <div>

      <button onClick={addItem}>Add Item</button>

      <ul>

        {items.map((item) => (

          <li key={item}>Item {item}</li>

        ))}

      </ul>

    </div>

  );

};

export default App;

answered Feb 22 by Kavya

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