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class SignupForm extends React.Component {
  constructor(props) {
    super(props);
    
    this.state = {
      username: ''
    };
    
    this._onchange = this.onChange.bind(this);
  }
  
  _onChange(e) {
    this.setState({
      [e.target.name]: e.target.value
    });
  }
  
  render() {
    return(
      <input value={this.state.username} onChange={this._onChange} name="username" />
    )
  }
}