Merge pull request #1353 from ydb-platform/xslices

Added xslices.Split + refactored xslices.Filter

Author: asmyasnikov

internal/xslices/filter.go

@@ -0,0 +1,13 @@
+package xslices
+
+func Filter[T any](in []T, filter func(t T) bool) (out []T) {
+	out = make([]T, 0, len(in))
+
+	for i := 0; i < len(in); i++ {
+		if filter(in[i]) {
+			out = append(out, in[i])
+		}
+	}
+
+	return out
+}

internal/xslices/filter_test.go

@@ -0,0 +1,14 @@
+package xslices
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFilter(t *testing.T) {
+	filtered := Filter([]int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, func(t int) bool {
+		return t%2 == 0
+	})
+	require.Equal(t, []int{0, 2, 4, 6, 8}, filtered)
+}

internal/xslices/split.go

@@ -1,11 +1,11 @@
 package xslices
 
-func Filter[T any](x []T, filter func(t T) bool) (good, bad []T) {
+func Split[T any](x []T, isOk func(t T) bool) (good, bad []T) {
 	good = make([]T, 0, len(x))
 	bad = make([]T, 0, len(x))
 
 	for i := 0; i < len(x); i++ {
-		if filter(x[i]) {
+		if isOk(x[i]) {
 			good = append(good, x[i])
 		} else {
 			bad = append(bad, x[i])

internal/xslices/split_test.go

@@ -6,8 +6,8 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestFilter(t *testing.T) {
-	good, bad := Filter([]int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, func(t int) bool {
+func TestSplit(t *testing.T) {
+	good, bad := Split([]int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, func(t int) bool {
 		return t%2 == 0
 	})
 	require.Equal(t, []int{0, 2, 4, 6, 8}, good)