An example of how to use github.com/looplab/tarjan

tarjan_example.go

graph := make(map[interface{}][]interface{})
graph["1"] = []interface{}{"2"}
graph["2"] = []interface{}{"3"}
graph["3"] = []interface{}{"1"}
graph["4"] = []interface{}{"2", "3", "5"}
graph["5"] = []interface{}{"4", "6"}
graph["6"] = []interface{}{"3", "7"}
graph["7"] = []interface{}{"6"}
graph["8"] = []interface{}{"5", "7", "8"}

output := Connections(graph)
fmt.Println(output)

// Output:
// [[3 2 1] [7 6] [5 4] [8]]