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