Use Go standard library slices package instead of k8s.io/utils/strings/slices

The package was introduced in Go 1.21 and is already in use in the k8s
code base.

staging/src/k8s.io/apimachinery/pkg/labels/selector.go

@@ -18,6 +18,7 @@ package labels
 
 import (
 	"fmt"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -27,7 +28,6 @@ import (
 	"k8s.io/apimachinery/pkg/util/validation"
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	"k8s.io/klog/v2"
-	stringslices "k8s.io/utils/strings/slices"
 )
 
 var (
@@ -313,7 +313,7 @@ func (r Requirement) Equal(x Requirement) bool {
 	if r.operator != x.operator {
 		return false
 	}
-	return stringslices.Equal(r.strValues, x.strValues)
+	return slices.Equal(r.strValues, x.strValues)
 }
 
 // Empty returns true if the internalSelector doesn't restrict selection space

staging/src/k8s.io/kubectl/pkg/cmd/apply/apply_test.go

@@ -25,6 +25,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -60,7 +61,6 @@ import (
 	"k8s.io/kubectl/pkg/scheme"
 	"k8s.io/kubectl/pkg/util/openapi"
 	"k8s.io/utils/ptr"
-	"k8s.io/utils/strings/slices"
 	"sigs.k8s.io/yaml"
 )
 

vendor/k8s.io/utils/strings/slices/slices.go

@@ -1,82 +0,0 @@
-/*
-Copyright 2021 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-// Package slices defines various functions useful with slices of string type.
-// The goal is to be as close as possible to
-// https://github.com/golang/go/issues/45955. Ideal would be if we can just
-// replace "stringslices" if the "slices" package becomes standard.
-package slices
-
-// Equal reports whether two slices are equal: the same length and all
-// elements equal. If the lengths are different, Equal returns false.
-// Otherwise, the elements are compared in index order, and the
-// comparison stops at the first unequal pair.
-func Equal(s1, s2 []string) bool {
-	if len(s1) != len(s2) {
-		return false
-	}
-	for i, n := range s1 {
-		if n != s2[i] {
-			return false
-		}
-	}
-	return true
-}
-
-// Filter appends to d each element e of s for which keep(e) returns true.
-// It returns the modified d. d may be s[:0], in which case the kept
-// elements will be stored in the same slice.
-// if the slices overlap in some other way, the results are unspecified.
-// To create a new slice with the filtered results, pass nil for d.
-func Filter(d, s []string, keep func(string) bool) []string {
-	for _, n := range s {
-		if keep(n) {
-			d = append(d, n)
-		}
-	}
-	return d
-}
-
-// Contains reports whether v is present in s.
-func Contains(s []string, v string) bool {
-	return Index(s, v) >= 0
-}
-
-// Index returns the index of the first occurrence of v in s, or -1 if
-// not present.
-func Index(s []string, v string) int {
-	// "Contains" may be replaced with "Index(s, v) >= 0":
-	// https://github.com/golang/go/issues/45955#issuecomment-873377947
-	for i, n := range s {
-		if n == v {
-			return i
-		}
-	}
-	return -1
-}
-
-// Functions below are not in https://github.com/golang/go/issues/45955
-
-// Clone returns a new clone of s.
-func Clone(s []string) []string {
-	// https://github.com/go101/go101/wiki/There-is-not-a-perfect-way-to-clone-slices-in-Go
-	if s == nil {
-		return nil
-	}
-	c := make([]string, len(s))
-	copy(c, s)
-	return c
-}

vendor/modules.txt

@@ -1219,7 +1219,6 @@ k8s.io/utils/path
 k8s.io/utils/pointer
 k8s.io/utils/ptr
 k8s.io/utils/strings
-k8s.io/utils/strings/slices
 k8s.io/utils/trace
 # sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.30.3
 ## explicit; go 1.21