good good study, day day up!

vendor/gopl.io/ch11/word2/word.go

@@ -0,0 +1,29 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 305.
+//!+
+
+// Package word provides utilities for word games.
+package word
+
+import "unicode"
+
+// IsPalindrome reports whether s reads the same forward and backward.
+// Letter case is ignored, as are non-letters.
+func IsPalindrome(s string) bool {
+	var letters []rune
+	for _, r := range s {
+		if unicode.IsLetter(r) {
+			letters = append(letters, unicode.ToLower(r))
+		}
+	}
+	for i := range letters {
+		if letters[i] != letters[len(letters)-1-i] {
+			return false
+		}
+	}
+	return true
+}
+
+//!-