gistfile1.txt

import React, { Component } from 'react';

export default class Follow extends Component {
  constructor(props) {
    super(props);
    
    this.state = {
      followed: this.props.followed
    }
    this.handleFollowClick = this.handleFollowClick.bind(this)
  }
  
  handleFollowClick() {
    this.setState({
      followed: !this.state.followed
    });
  }
  
  render() {

    return (
      <input
        className="follow"
        onClick={this.handleFollowClick()}
        style={{backgroundColor: followed ? 'green' : 'red'}}
        value={followed ? 'Follow' : 'Following'}
        />
    );
  }
}