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How to add object in an array using useState

By Charlie ChaplinCharlie Chaplin on Dec 13, 2020 
import React, { useState } from 'react';
 
function App() {
 
  const [items, setItems] = useState([]);
 
  // handle click event of the button to add item
  const addMoreItem = () => {
    setItems(prevItems => [...prevItems, {
      id: prevItems.length,
      value: getRandomNumber()
    }]);
  }
 
  // generate 6 digit random number
  const getRandomNumber = () => {
    return Math.random().toString().substring(2, 8);
  }
 
  return (
    <div classname="App">
      <h3>useState with an array in React Hooks - <a href="https://www.cluemediator.com">Clue Mediator</a></h3>
      <br>
      <button onclick="{addMoreItem}">Add More</button>
      <br><br>
      <label>Output:</label>
      <pre>{JSON.stringify(items, null, 2)}</pre>
    </div>
  );
}
 
export default App;

Source: www.cluemediator.com

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add object to array setstate

By Ashamed AnteaterAshamed Anteater on Oct 06, 2020 
To push to the beginning of the array do it this way

   this.setState( prevState => ({
     userFavorites: [{id: 3, title: 'C'}, ...prevState.userFavourites]
  }));

Source: stackoverflow.com

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