React. Form with dynamic inputs that setState for values and submit

react-form-set-state-input-and-submit.js

class Form extends Component {
  state = {};
  renderInput = (name, type, value='') =>
    <input onChange={({target}) => this.setState({[name]: target.value})} name={name} type={type} value={this.state[name] || value}/>;
    
  handleSubmit = (evt) => {
    evt.preventDefault();
    send('/form', this.state);
  }
  
  render() {
    return <form onSubmit={this.handleSubmit}>
      {this.renderInput('firstName', 'text')}
      {this.renderInput('lastName', 'text')}
      <button type="submit"/>
    </form>;
  }

}