collection function _ golang

package main
import (
 "fmt"
 "strings"
)
func Index(vs []string, t string) int {
 for i, v := range vs {
 if v == t {
 return i
 }
 }
 return -1
}
func Include(vs []string, t string) bool {
 return Index(vs, t) >= 0
}
func Any(vs []string, f func(string) bool) bool {
 for _, v := range vs {
 if f(v) {
 return true
 }
 }
 return false
}
func All(vs []string, f func(string) bool) bool {
 for _, v := range vs {
 if !f(v) {
 return false
 }
 }
 return true
}
func Filter(vs []string, f func(string) bool) []string {
 vsf := make([]string, 0)
 for _, v := range vs {
 if f(v) {
 vsf = append(vsf, v)
 }
 }
 return vsf
}
func Map(vs []string, f func(string) string) []string {
 vsm := make([]string, len(vs))
 for i, v := range vs {
 vsm[i] = f(v)
 }
 return vsm
}
func main() {
 var strs = []string{"peach", "apple", "pear", "plum"}
 fmt.Println(Index(strs, "pear"))
 fmt.Println(Include(strs, "grape"))
 fmt.Println(Any(strs, func(v string) bool {
 return strings.HasPrefix(v, "p")
 }))
 fmt.Println(All(strs, func(v string) bool {
 return strings.HasPrefix(v, "p")
 }))
 fmt.Println(Filter(strs, func(v string) bool {
 return strings.Contains(v, "e")
 }))
 fmt.Println(Map(strs, strings.ToUpper))
}

2
false
true
false
[peach apple pear]
[PEACH APPLE PEAR PLUM]

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