Add mathutil (#267)

Co-authored-by: Jordan Krage <[email protected]>
Co-authored-by: Dmytro Haidashenko <[email protected]>

pkg/utils/mathutil/mathutil.go

@@ -0,0 +1,23 @@
+package mathutil
+
+import "golang.org/x/exp/constraints"
+
+func Max[V constraints.Ordered](first V, vals ...V) V {
+	max := first
+	for _, v := range vals {
+		if v > max {
+			max = v
+		}
+	}
+	return max
+}
+
+func Min[V constraints.Ordered](first V, vals ...V) V {
+	min := first
+	for _, v := range vals {
+		if v < min {
+			min = v
+		}
+	}
+	return min
+}

pkg/utils/mathutil/mathutil_test.go

@@ -0,0 +1,33 @@
+package mathutil
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMax(t *testing.T) {
+	// Happy path
+	assert.Equal(t, 3, Max(3, 2, 1))
+	// Single element
+	assert.Equal(t, 3, Max(3))
+	// Signed
+	assert.Equal(t, -1, Max(-2, -1))
+	// Uint64
+	assert.Equal(t, uint64(2), Max(uint64(0), uint64(2)))
+	// String
+	assert.Equal(t, "c", Max("a", []string{"b", "c"}...))
+}
+
+func TestMin(t *testing.T) {
+	// Happy path
+	assert.Equal(t, 1, Min(3, 2, 1))
+	// Single element
+	assert.Equal(t, 3, Min(3))
+	// Signed
+	assert.Equal(t, -2, Min(-2, -1))
+	// Uint64
+	assert.Equal(t, uint64(0), Min(uint64(0), uint64(2)))
+	// String
+	assert.Equal(t, "a", Min("a", []string{"b", "c"}...))
+}