add: strings and projects

19-strings-runes-bytes/04-rune-decoding/02/main.go

@@ -0,0 +1,43 @@
+// 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 (
+	"bytes"
+	"fmt"
+	"unicode/utf8"
+)
+
+func main() {
+	word := []byte("öykü")
+	fmt.Printf("%s = % [1]x\n", word)
+
+	// how to make the first rune uppercase?
+
+	// you need to find the starting and ending position of the first rune
+
+	// 1st way: `for range`
+	// you can't get the runes by range overing a byte slice
+	// first, you need to convert it to a string
+	var size int
+	for i := range string(word) {
+		if i > 0 {
+			size = i
+			break
+		}
+	}
+
+	// 2nd way: let's do it using the utf8 package's DecodeRune function
+	_, size = utf8.DecodeRune(word)
+
+	// overwrite the current bytes with the new uppercased bytes
+	copy(word[:size], bytes.ToUpper(word[:size]))
+
+	// to get printed bytes/runes need to be encoded in a string
+	fmt.Printf("%s = % [1]x\n", word)
+}