update: functional log parser

advfuncs/new/01-intro/passfunc/main.go

@@ -0,0 +1,53 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+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)
+}