Added min and max

sliceops.go

@@ -0,0 +1,41 @@
+package sliceops
+
+//import "math"
+
+// Returns the minimum value in the slice and the index of
+// the minimum value. If the input slice is empty, zero is returned
+// as the minimum value and -1 is returned as the index.
+// Use: val,ind := sliceops.Min(slice)
+func Min(s []float64) (min float64, ind int) {
+	if len(s) == 0 {
+		return min, -1 // Ind is -1 to make clear it's not the zeroth index.
+	}
+	min = s[0]
+	ind = 0
+	for i, val := range s {
+		if val < min {
+			min = val
+			ind = i
+		}
+	}
+	return min, ind
+}
+
+// Returns the maximum value in the slice and the location of
+// the maximum value. If the input slice is empty, zero is returned
+// as the minimum value and -1 is returned as the index.
+// Use: val,ind := sliceops.Max(slice)
+func Max(s []float64) (max float64, ind int) {
+	if len(s) == 0 {
+		return max, -1 // Ind is -1 to make clear it's not the zeroth index.
+	}
+	max = s[0]
+	ind = 0
+	for i, val := range s {
+		if val > max {
+			max = val
+			ind = i
+		}
+	}
+	return max, ind
+}

sliceops_test.go

@@ -0,0 +1,49 @@
+package sliceops
+
+import (
+	"testing"
+)
+
+const (
+	SmallBenchmark  = 10
+	MediumBenchmark = 1000
+	LargeBenchmark  = 100000
+)
+
+func TestMin(t *testing.T) {
+	s := []float64{}
+	val, ind := Min(s)
+	if val != 0 {
+		t.Errorf("Val not returned as default when slice length is zero")
+	}
+	if ind != -1 {
+		t.Errorf("Ind not returned as -1 for empty slice")
+	}
+	s = []float64{3, 4, 1, 7, 5}
+	val, ind = Min(s)
+	if val != 1 {
+		t.Errorf("Wrong minimum returned")
+	}
+	if ind != 2 {
+		t.Errorf("Wrong index returned")
+	}
+}
+
+func TestMax(t *testing.T) {
+	s := []float64{}
+	val, ind := Max(s)
+	if val != 0 {
+		t.Errorf("Val not returned as default when slice length is zero")
+	}
+	if ind != -1 {
+		t.Errorf("Ind not returned as -1 for empty slice")
+	}
+	s = []float64{3, 4, 1, 7, 5}
+	val, ind = Max(s)
+	if val != 7 {
+		t.Errorf("Wrong minimum returned")
+	}
+	if ind != 3 {
+		t.Errorf("Wrong index returned")
+	}
+}