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Domenico
04 Jan 2021
1import React from 'react';
2 
3const initialList = [
4  'Learn React',
5  'Learn Firebase',
6  'Learn GraphQL',
7];
8 
9const ListWithAddItem = () => {
10  const [value, setValue] = React.useState('');
11  const [list, setList] = React.useState(initialList);
12 
13  const handleChange = event => {
14    setValue(event.target.value);
15  };
16 
17  const handleSubmit = event => {
18    if (value) {
19      setList(list.concat(value));
20    }
21 
22    setValue('');
23 
24    event.preventDefault();
25  };
26 
27  return (
28    <div>
29      <ul>
30        {list.map(item => (
31          <li key={item}>{item}</li>
32        ))}
33      </ul>
34 
35      <form onSubmit={handleSubmit}>
36        <input type="text" value={value} onChange={handleChange} />
37        <button type="submit">Add Item</button>
38      </form>
39    </div>
40  );
41};
42 
43export default ListWithAddItem;
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