resolveElevation method

Implementation

double resolveElevation(String? value) {
  final String v = value ?? "default";
  final dynamic group = hostConfig["elevations"];
  if (group is Map) {
    final dynamic raw = group[firstCharacterToLowerCase(v)];
    if (raw is num) return raw.toDouble();
  }
  return 0.0;
}