How To Compute Moving Average Convergence Divergence (MACD) in Dart?

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double calculateEMA(List<double> values, int period) {
  double k = 2.0 / (period + 1);
  double ema = values.first;
  
  for (int i = 1; i < values.length; i++) {
    ema = (values[i] - ema) * k + ema;
  }
  
  return ema;
}

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List<double> calculateMACD(List<double> values, int shortPeriod, int longPeriod) {
  List<double> shortEMAValues = [];
  List<double> longEMAValues = [];
  
  for (int i = longPeriod - 1; i < values.length; i++) {
    shortEMAValues.add(calculateEMA(values.sublist(i - shortPeriod + 1, i + 1), shortPeriod));
    longEMAValues.add(calculateEMA(values.sublist(i - longPeriod + 1, i + 1), longPeriod));
  }
  
  List<double> macdLineValues = [];
  
  for (int i = 0; i < shortEMAValues.length; i++) {
    macdLineValues.add(shortEMAValues[i] - longEMAValues[i]);
  }
  
  return macdLineValues;
}