setEdge method
Implementation
Graph setEdge(String a, String b, {String label = ""}) {
for (var i = 0; i < _edges.length; i++) {
if (_edges[i].a == a && _edges[i].b == b) {
_edges[i] = (a: a, b: b, label: label);
return this;
}
}
_edges.add((a: a, b: b, label: label));
return this;
}