maps: add Kvs, and values is keys order

maps/maps.go

@@ -25,6 +25,18 @@ func Values[M ~map[K]V, K comparable, V any](m M) []V {
 	return r
 }
 
+// Kvs returns the keys and values of the map m.
+// The keys and values will be in an indeterminate order.
+func Kvs[M ~map[K]V, K comparable, V any](m M) ([]K, []V) {
+	rK := make([]K, 0, len(m))
+	rV := make([]V, 0, len(m))
+	for k, v := range m {
+		rK = append(rK, k)
+		rV = append(rV, v)
+	}
+	return rK, rV
+}
+
 // Equal reports whether two maps contain the same key/value pairs.
 // Values are compared using ==.
 func Equal[M1, M2 ~map[K]V, K, V comparable](m1 M1, m2 M2) bool {

maps/maps_test.go

@@ -10,6 +10,8 @@ import (
 	"strconv"
 	"testing"
 
+	"github.com/google/go-cmp/cmp"
+
 	"golang.org/x/exp/slices"
 )
 
@@ -48,6 +50,15 @@ func TestValues(t *testing.T) {
 	}
 }
 
+func TestKvs(t *testing.T) {
+	ks, vs := Kvs(m1)
+	for idx, k := range ks {
+		if !cmp.Equal(m1[k], vs[idx]) {
+			t.Errorf("key %v want value %v, but  %v", k, m1[k], vs[idx])
+		}
+	}
+}
+
 func TestEqual(t *testing.T) {
 	if !Equal(m1, m1) {
 		t.Errorf("Equal(%v, %v) = false, want true", m1, m1)