func Contains(s, needle []rune) bool
func Equal(a, b []rune) bool
func HasPrefix(s, prefix []rune) bool
HasPrefix tests whether the string s begins with prefix.
func HasSuffix(s, suffix []rune) bool
HasSuffix tests whether the string s ends with suffix.
func Index(s, needle []rune) int
func IndexAny(s, chars []rune) int
IndexAny returns the index of the first instance of any Unicode code point from chars in s, or -1 if no Unicode code point from chars is present in s.
func IndexLastRune(s []rune, r rune) int
func IndexRune(s []rune, r rune) int
func LastIndex(s, needle []rune) int
func Max(s []rune) (max rune)
func Min(s []rune) rune