如何在react中从map中获取第一个值

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      data: []
    };
  }

  componentDidMount() {
    const myMap = new Map();
    myMap.set(1, 'First');
    myMap.set(2, 'Second');
    myMap.set(3, 'Third');

    const dataArray = Array.from(myMap.values());
    this.setState({ data: dataArray });
  }

  render() {
    const { data } = this.state;
    const firstValue = data.length > 0 ? data[0] : '';

    return (
      <div>
        <p>First value from map: {firstValue}</p>
      </div>
    );
  }
}

export default MyComponent;