yValueOrNull static method

double? yValueOrNull(Object? item)

Implementation

static double? yValueOrNull(Object? item) {
  if (item == null) return null;

  final scalar = numeric(item);
  if (scalar != null) return scalar;

  if (item is List) {
    if (item.length > 1) {
      final y = numeric(item[1]);
      if (y != null) return y;
    }
    if (item.isNotEmpty) {
      final first = numeric(item.first);
      if (first != null) return first;
    }
    if (item.isNotEmpty) {
      final last = numeric(item.last);
      if (last != null) return last;
    }
    return null;
  }

  final map = JsonValue.map(item);
  if (map != null) {
    if (_hasCompleteOhlcMap(map)) {
      return _ohlcCloseFromMap(map);
    }
    for (final key in const [
      'y',
      'value',
      'close',
      'mean',
      'amount',
      'count',
      'size',
    ]) {
      final value = numeric(map[key]);
      if (value != null) return value;
    }
    return null;
  }

  try {
    final dynamic dynamicItem = item;
    return numeric(dynamicItem.value);
  } catch (_) {
    return null;
  }
}