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              .bar {
  transition: top .5s;
}
.bar__label, .label {
  display: inline-block;
  font-family: sans-serif;
  font-size: 10px;
  line-height: 20px;
  text-transform: uppercase;
  vertical-align: top;
}
.bar__label {
  text-align: right;
  width: 50px;
}

.bar__mark {
  background: orange;
  display: inline-block;
  height: 16px;
  margin-left: 10px;
  margin-top: 2px;
  transition: width 1s;
}

.switch__track {
  border-radius: 10px;
  box-shadow: inset 0px 1px 3px 0px rgba(0,0,0,0.50);
  display: inline-block;
  margin: 0 20px;
  position: relative;
  width: 60px;
  height: 20px;
  background: #c0c0c0;
}

.switch__thumb {
  background: #d6d6d5;
  border-radius: 10px;
  position: relative;
  left: 1px;
  top: 1px;
  width: 18px;
  height: 18px;
  transition: left .5s;
}

.switch__thumb.death {
  left: 41px;
}

.label {
  
}
            
          
!
            
              // dataset 'birthdeathrates' loaded from pen https://codepen.io/jckr/pen/JKXLVe
// form: array of objects with country, birth and death properties

class Chart extends React.Component {
   constructor(props) {
     super(props);
        
     this.state = {
       metric: 'birth',
     };
   }
  render() {
    const metric = this.state.metric;
    const data = this.props.data.sort((a,b) => b[metric] - a[metric])
      .map((d, i) => ({...d, rank: i}))
      .sort((a, b) => b.country > a.country);
  
    return <div className='chart'>
      {[
       <span className='label'>Birth rate</span>,
       <Switch metric={metric} updateMetric={(d) =>
            this.setState({metric: d})
       }/>,
       <span className='label'>Death rate</span>,
       <div>
         {data.map(d => 
          <Bar 
            country={d.country} value={d[metric]} rank={d.rank}/>
         )}
      </div>
      ]}
    </div>;
  }
}


// using pure functional components for the rest 
function Switch({metric, updateMetric}) {
  return <div className = 'switch__track'
           onClick = {() => updateMetric(metric === 'birth' ? 'death' : 'birth')}
           >
           <div className = {'switch__thumb ' + metric} />
         </div>
};

function Bar({country, value, rank}) {
  return <div
    className='bar'
    style={{position: 'absolute',
    top: 30 + 20 * rank,
    transition: 'top .5s'}} >
    <div className='bar__label'>{country}</div>
    <div className='bar__mark' 
      style={{width: 4 * value}}/>
    </div>;    
}

const chart = <Chart data={birthdeathrates} />

ReactDOM.render(chart, document.querySelector('#root'));
            
          
!
999px
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