How To Calculate Average True Range (ATR) using Dart?

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import 'dart:math';

// Function to calculate True Range
double trueRange(double high, double low, double previousClose) {
  return max(high - low, max((high - previousClose).abs(), (low - previousClose).abs()));
}

// Function to calculate Average True Range (ATR)
double averageTrueRange(List<double> highs, List<double> lows, List<double> closes, int period) {
  List<double> trueRanges = [];
  double atr = 0.0;

  for (int i = 1; i < highs.length; i++) {
    double tr = trueRange(highs[i], lows[i], closes[i - 1]);
    trueRanges.add(tr);

    if (i >= period) {
      double sum = 0.0;
      for (int j = i - period + 1; j <= i; j++) {
        sum += trueRanges[j];
      }
      atr = sum / period;
    }
  }

  return atr;
}

void main() {
  List<double> highs = [10.0, 12.0, 14.0, 15.0, 16.0];
  List<double> lows = [8.0, 10.0, 12.0, 13.0, 14.0];
  List<double> closes = [9.0, 11.0, 13.0, 14.0, 15.0];
  int period = 3;

  double atr = averageTrueRange(highs, lows, closes, period);
  print('Average True Range (ATR): $atr');
}