doubleArgument method

double? doubleArgument(
  1. String? argKey
)

double类型参数, 如果无法解析, 返回null

Implementation

double? doubleArgument(String? argKey) {
  final arg = argument(argKey);
  if (arg == null) {
    return null;
  }
  return double.tryParse(arg.toString());
}