[Chartjs]-Updating Chartjs dataset in Ionic

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The Array.concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.

Therefore, you should change your loadData() method as follows:

loadData() {
  if (this.count > 10) {
    return clearInterval(this.interval);
  }
  const { data, labels } = this.dataService.getData();
  this.chart.data.labels = this.chart.data.labels.concat(labels);
  this.chart.data.datasets.forEach(ds => ds.data = ds.data.concat(data));
  this.count++;
  this.chart.update();
}

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