[Chartjs]-Chartjs destroy method not affecting the chart

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var ctx = document.getElementById("barChart");
var barChart = new Chart(ctx, {
type: 'bar',
data: {
    labels: ["Dog", "Cat", "Pangolin"],
    datasets: [{
              backgroundColor: '#00ff00',
        label: '# of Votes 2016',
        data: [12, 19, 3]
        }]
    }
});

function addData(chart, label, color, data) {
  chart.data.datasets=[];
    chart.data.datasets.push({
    label: label,
  backgroundColor: color,
  data: data
});
chart.update();
}

// Changing the new dataset after 2 seconds

setTimeout(function() {
   addData(barChart, '# of Votes 2017', '#ff0000', [16, 14, 8]);
 }, 2000);

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