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HTML

              
                <div id='container'>Loading...</div>

              
            
!

CSS

              
                body {
  background: #d5d5d5; 
  font-family: arial;
  color: #FAFAFA;
  text-transform: uppercase;
}

.scoreboard {
  background: #333;
  width: 700px;
  margin: 70px auto;
  box-shadow: 0 4px 0px #333;
  border-radius: 15px;

}

.header {
  padding: 5px 10px;
  text-align: center;
  display: flex;
  align-items: center;
  background-color: #222;
  border-radius: 15px 15px 0 0;
  border-bottom: solid 2px #444;
}

.header h1 {
  flex-grow: 1;
  font-size: 1.5em;
  letter-spacing: 3px;
  font-weight: normal;
}

.header .stats,
.header .stopwatch {
  width: 170px;
}

.stats {
  margin-top: 0;
  font-weight: normal;
}

  .stats td:first-child {
    text-align: right;
    font-weight: normal;
    letter-spacing: 2px;
    color: #666;
    font-size: .7em;
  }

  .stats td:last-child {
    text-align: left;
  }

.stopwatch {
  padding: 15px 10px 5px 10px;
  margin: -5px -10px -5px 10px;
  background: #2f2f2f;
  border-radius: 0 15px 0 0;
}

  .stopwatch-time {
    font-family: monospace;
    font-size: 2em;
  }

  .stopwatch button {
    margin: 8px 5px;
    background-color: #222;
    border-radius: 5px;
    padding: 7px 8px;
    border: none;
    color: #999;
    letter-spacing: 2px;
    font-weight: bold;
    text-shadow: none;
    text-transform: uppercase;
  }

  .stopwatch button:hover {
    background: #4b71b5;
    color: #fafafa;
    cursor: pointer;
  }

  .stopwatch h2 {
    font-size: .6em;
    margin: 0;
    font-weight: normal;
    letter-spacing: 2px;
    color: #666;
  }

.player {
  display: flex;
  font-size: 1.2em;
  border-bottom: solid 2px #444;
  letter-spacing: 2px;
}

  .remove-player {
    visibility: hidden;
    margin-right: 10px;
    color: #e57373;
    cursor: pointer;
  }

  .player-name:hover .remove-player {
    visibility: visible;
  }

  .player-name {
    flex-grow: 1;
    padding: 20px 10px 10px 10px;
  }

  .player-score {
    width: 190px;
    background: blue;
  }

  .counter {
    display: flex;
  }

  .counter-action {
    border: none;
    font-weight: bold;
    color: #FAFAFA;
    display: block;
    padding: 20px 20px;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
  }

  .counter-action.increment {
    background: #66BB6A;
  }

  .counter-action.increment:hover {
    background: #549d59;
    cursor: pointer;
  }

  .counter-action.decrement {
    background: #ef5350;
  }

  .counter-action.decrement:hover {
    background: #c44442;
    cursor: pointer;
  }

  .counter-score {
    flex-grow: 1;
    background: #2b2b2b;
    color: #FAFAFA;
    text-align: center;
    font-family: monospace;
    padding: 10px;
    font-size: 2em;
  }


.add-player-form form {
  display: flex;
  background-color: #222;
  border-radius: 0 0 20px 20px
}

  .add-player-form input[type=text] {
    flex-grow: 1;
    border-width: 0 0 1px 0;
    margin: 15px 10px 15px 15px;
    padding: 10px;
    border-radius: 5px;
    background-color: #333;
    border-style: none;
    text-shadow: none;
    text-transform: uppercase;
    color: #999;
    letter-spacing: 2px;
    outline: none;
  }

  .add-player-form input[type=text]::-webkit-input-placeholder{
    color: #666;
    letter-spacing: 2px;
  }

  .add-player-form input[type=text]:focus{
    background-color: #444;
  }

  .add-player-form input[type=submit] {
    display: block;
    font-size: .6em;
    margin: 15px 15px 15px 0; 
    padding: 10px;
    background-color: #333;
    border-radius: 5px;
    border: none;
    color: #999;
    letter-spacing: 2px;
    font-weight: bold;
    text-shadow: none;
    text-transform: uppercase;
  }

  .add-player-form input[type=submit]:hover{
    background: #4b71b5;
    color: #fafafa;
    cursor: pointer;
  }
              
            
!

JS

              
                var PLAYERS = [
  {
    name: "John",
    score: 31,
    id: 1,
  },
  {
    name: "Dale",
    score: 33,
    id: 2,
  },
  {
    name: "bill",
    score: 43,
    id: 3,
  },
];

var nextId = 4;

var Stopwatch = React.createClass({
  getInitialState: function(){
    return{
      running: false,
      elapsedTime:0,
      previousTime:0,
    }
  },
  
  componentDidMount: function(){
    this.interval = setInterval(this.onTick, 100);
  },
  componentWillUnmount: function(){
    clearInterval(this.interval);
  },
  onTick: function(){
    if(this.state.running){
       var now = Date.now();
      this.setState({
        previousTime:now,
        elapsedTime: this.state.elapsedTime + (now - this.state.previousTime),
      });
       }
  },
  
  onStart : function(){
    this.setState({
      running: true,
      previousTime: Date.now(),
    });
  },
  onStop : function(){
    this.setState({ running: false });
  },
  onReset : function(){
    this.setState({
      elapsedTime:0,
      previousTime: Date.now(),
    });
  },
  
  render: function(props){
    var seconds = Math.floor(this.state.elapsedTime / 1000);
    
    return(
      <div className="stopwatch">
        <h2>Stopwatch</h2>
        <div className="stopwatch-time">{seconds}</div>
        { this.state.running ? 
          <button onClick={this.onStop}>Stop</button> 
          : 
          <button onClick={this.onStart}>Start</button> 
        }
        <button onClick={this.onReset}>Reset</button>
      </div>
    );
  }
});

var AddPlayerForm = React.createClass({
  propTypes:{
    onAdd: React.PropTypes.func.isRequired,
  },
  
  getInitialState: function(){
    return{
      name:"",
    };
  },
  
  onNameChange: function(e){
    // console.log('onNameChange', e.target.value);
    this.setState({name:e.target.value});
  },
  
  onSubmit: function(e){
    e.preventDefault();
    
    this.props.onAdd(this.state.name);
    this.setState({name:""});
  },
  
  render: function(){
    return(
      <div className="add-player-form">
        <form onSubmit={this.onSubmit}>
          <input type="text" value={this.state.name}  onChange={this.onNameChange}/>
          <input type="submit" value="Add Player"/>
        </form>
      </div>
    )
  }
});

function Stats(props) {
  var totalPlayers = props.players.length;
  var totalPoints = props.players.reduce(function(total,player){
    return total + player.score;
  },0);
  
  return(
    <table className="stats">
      <tbody>
        <tr>
          <td>Players:</td>
          <td>{totalPlayers}</td>
        </tr>
        <tr>
          <td>Total Points:</td>
          <td>{totalPoints}</td>
        </tr>
      </tbody>
    </table>
  )
}
Stats.propTypes = {
  players: React.PropTypes.array.isRequired,  
}

function Header(props){
  return(
    <div className="header">
      <Stats players={props.players}/>
        <h1>{props.title}</h1>
      <Stopwatch />
      </div>
  );
}
Header.propTypes = {
  title: React.PropTypes.string.isRequired, //EXPECTS ONLY STRINGS IN TITLE ATTRIBUTE
  players: React.PropTypes.array.isRequired,
};

function Counter(props){
  return(
      <div className="counter">
        <button className="counter-action decrement" onClick={function(){props.onChange(-1);}}>-</button>
        <div className="counter-score">{props.score}</div>
        <button className="counter-action increment" onClick={function(){props.onChange(1);}}>+</button>
      </div>   
    );
}
Counter.propTypes = {
  score: React.PropTypes.number.isRequired,
  onChange: React.PropTypes.func.isRequired,
}

function Player(props){
  return(
    <div className="players">
        <div className="player">
          <div className="player-name">
            <a className="remove-player" onClick={props.onRemove}>x</a>
            {props.name}
          </div>
          
          <div className="player-score">
            <Counter score={props.score} onChange={props.onScoreChange}/>
          </div>
        </div>
      </div>
  );
};
Player.propTypes = {
  name: React.PropTypes.string.isRequired,
  score: React.PropTypes.number.isRequired,
  onScoreChange: React.PropTypes.func.isRequired,
  onRemove:React.PropTypes.func.isRequired,
};

var Application = React.createClass({
  
  propTypes: {
  title: React.PropTypes.string, //EXPECTS ONLY STRINGS IN TITLE ATTRIBUTE
  InitialPlayers: React.PropTypes.arrayOf(React.PropTypes.shape({
    name: React.PropTypes.string.isRequired,
    score: React.PropTypes.number.isRequired,
    id: React.PropTypes.number.isRequired,
  })).isRequired,
},
  
  getDefaultProps: function(){
    return {
      title: "Scoreboard",
    }
  },
  
  getInitialState: function(){
    return{
      players: this.props.InitialPlayers,
    };
  },
  
  onScoreChange: function(index,delta){
    // console.log('onScoreChange',index,delta);
    this.state.players[index].score += delta;
    this.setState(this.state);
  },
  
  onPlayerAdd: function(name){
    // console.log('Player Added', name);
    this.state.players.push({
      name: name,
      score: 0,
      id: nextId,
    });
    this.setState(this.state);
    nextId +=1;
  },
  
  onRemovePlayer:function(index){
    this.state.players.splice(index,1);
    this.setState(this.state);
    // console.log('remove',index);
  },
  
  render: function(){
      return (
      <div className="scoreboard">
        <Header title={this.props.title} players={this.state.players}/>

        <div className="players">
          {this.state.players.map(function(player,index){
            return(
              <Player 
                onScoreChange={function(delta) {this.onScoreChange(index,delta)}.bind(this)}
                onRemove={function(){this.onRemovePlayer(index)}.bind(this)}
                name={player.name}
                score={player.score} 
                key={player.id}
                />
            );
          }.bind(this))}
        </div>
          <AddPlayerForm onAdd={this.onPlayerAdd}/>
      </div>
    );
  }
});

ReactDOM.render(<Application InitialPlayers={PLAYERS}/>, document.getElementById('container'));
              
            
!
999px

Console