main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
"unicode"
)
func main() {
s := "Func Values Are Awesome..."
// s = strings.Map(unicode.ToUpper, s)
// s = strings.Map(unicode.ToLower, s)
// s = strings.Map(excite, s)
// s = strings.Map(calm, s)
// fmt.Printf("%T\n", strings.Map)
s = mapx(calm, s)
fmt.Println(s)
}
func mapx(mapping func(rune) rune, s string) string {
var ns []rune
for _, r := range s {
if r = mapping(r); r == -1 {
continue
}
ns = append(ns, r)
}
return string(ns)
}
func calm(r rune) rune {
if unicode.IsPunct(r) {
return -1
}
return unicode.ToLower(r)
}
func excite(r rune) rune {
if r == '.' {
return '!'
}
return unicode.ToTitle(r)
}
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