putEdge method
E
putEdge(
- V source,
- V target,
- E ifAbsent()
Look up the value of the edge between source
and target
, or add a new
edge with the value of ifAbsent
if it isn't there.
Implementation
E putEdge(V source, V target, E Function() ifAbsent) {
final edge = getEdge(source, target);
if (edge != null) return edge.value;
final value = ifAbsent();
addEdge(source, target, value: value);
return value;
}