createAddtoVertical method

List<NamedLine> createAddtoVertical(
  1. String name,
  2. List<NamedLine> ifAbsent()
)

Implementation

List<NamedLine> createAddtoVertical(String name, List<NamedLine> Function() ifAbsent){
  return verticalLines.putIfAbsent(name, ifAbsent);
}