Исходники и презентации

lessons/strings/runes_to_bytes/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"bytes"
+	"unicode/utf8"
+)
+
+func Runes2Bytes(rs []rune) []byte {
+	n := 0
+	for _, r := range rs {
+		n += utf8.RuneLen(r)
+	}
+
+	n, bs := 0, make([]byte, n)
+	for _, r := range rs {
+		n += utf8.EncodeRune(bs[n:], r)
+	}
+
+	return bs
+}
+
+func main() {
+	s := "Hello world!!!"
+
+	bs := []byte(s) // string -> []byte
+	s = string(bs)  // []byte -> string
+
+	rs := []rune(s) // string -> []rune
+	s = string(rs)  // []rune -> string
+
+	rs = bytes.Runes(bs) // []byte -> []rune
+	bs = Runes2Bytes(rs) // []rune -> []byte
+}