go(stats): implement sort.Interface for types

stats/stats.go

@@ -59,6 +59,34 @@ type Stats struct {
 	Generations    int
 }
 
+// the following three methods implement the sort.Interface.
+func (a AlgoMean) Len() int {
+	return len(a.Means)
+}
+
+func (a AlgoMean) Less(i, j int) bool {
+	return a.Means[i].Bench < a.Means[j].Bench
+}
+
+func (a AlgoMean) Swap(i, j int) {
+	a.Means[i], a.Means[j] = a.Means[j], a.Means[i]
+}
+
+// the following three methods also implement the sort.Interface.
+func (m MeanStats) Len() int {
+	return len(m.AlgoMeans)
+}
+
+// this in fact sorts in reverse (fits with our use case atm).
+func (m MeanStats) Less(i, j int) bool {
+	// return m.AlgoMeans[i].Algo < m.AlgoMeans[j].Algo
+	return m.AlgoMeans[i].Algo > m.AlgoMeans[j].Algo
+}
+
+func (m MeanStats) Swap(i, j int) {
+	m.AlgoMeans[i], m.AlgoMeans[j] = m.AlgoMeans[j], m.AlgoMeans[i]
+}
+
 func GetFuncStats(funcName string, benchResults []BenchRound) FuncStats {
 	f := FuncStats{
 		BenchName:    funcName,