React Select All Checkbox | Unselect All

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
  </head>
  <body>
    <div id="app"></div>
    <script type="text/babel">
      const { useState } = React;

function App() {
        const countries = [
          { id: "1", countryName: "AMERICA" },
          { id: "2", countryName: "AUSTRALIA" },
          { id: "3", countryName: "INDIA" },
          { id: "4", countryName: "ENGLAND" },
        ];
        const [checked, setChecked] = useState([]);

const handleCheckAllChange = (e) => {
          setChecked(
            e.target.checked ? countries.map((c) => c.countryName) : []
          );
        };

const handleCountryChange = (e, c) => {
          setChecked((prevChecked) =>
            e.target.checked
              ? [...prevChecked, c.countryName]
              : prevChecked.filter((item) => item !== c.countryName)
          );
        };

return (
          <div className="container">
            <h3>React Js Checkbox Select All | Unselect All </h3>
            <div className="form-check">
              <input
                className="form-check-input"
                type="checkbox"
                id="selectAll"
                checked={checked.length === countries.length}
                onChange={handleCheckAllChange}
              />
              <label className="form-check-label" htmlFor="selectAll">
                Select all
              </label>
            </div>
            {countries.map((c) => (
              <div className="form-check form-check-inline" key={c.id}>
                <input
                  className="form-check-input"
                  type="checkbox"
                  id={c.id}
                  checked={checked.includes(c.countryName)}
                  onChange={(e) => handleCountryChange(e, c)}
                />
                <label className="form-check-label" htmlFor={c.id}>
                  {c.countryName}
                </label>
              </div>
            ))}
            <p>{checked.join(", ")}</p>
          </div>
        );
      }
      ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
      .container {
        width: 400px;
        margin: 0 auto;
        box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12),
          0 2px 4px 0 rgba(0, 0, 0, 0.24);
        padding: 20px;
      }

/* CSS for header */
      h3 {
        margin: 0 0 15px;
        font-size: 18px;
        font-weight: bold;
        color: #333;
      }

/* CSS for form-check */
      .form-check {
        margin-bottom: 10px;
      }

/* CSS for checkbox input */
      .form-check-input {
        margin-right: 8px;
      }

/* CSS for checkbox label */
      .form-check-label {
        font-size: 16px;
        color: #333;
      }

/* CSS for selected countries paragraph */
      p {
        margin-top: 15px;
        font-size: 14px;
        color: #666;
      }

/* Styling for the "Select all" checkbox label when checked */
      .form-check-input:checked + .form-check-label {
        font-weight: bold;
        color: #2196f3; /* Change to your desired color */
      }
    </style>
  </body>
</html>