LastIndexFunc in Go

Posted by GoDoc
Public (Editable by Users)

LastIndexFunc interprets s as a sequence of UTF-8-encoded code points. It returns the byte index in s of the last Unicode code point satisfying f(c), or -1 if none do.

Go
Edit 
package main

import (
	"bytes"
	"fmt"
	"unicode"
)

func main() {
	fmt.Println(bytes.LastIndexFunc([]byte("go gopher!"), unicode.IsLetter))
	fmt.Println(bytes.LastIndexFunc([]byte("go gopher!"), unicode.IsPunct))
	fmt.Println(bytes.LastIndexFunc([]byte("go gopher!"), unicode.IsNumber))
}