From f9e02ded8c7da3421021e71087dee0fcb67305b4 Mon Sep 17 00:00:00 2001
From: Openset <openset.wang@gmail.com>
Date: 2019年1月22日 20:54:41 +0800
Subject: [PATCH] Update: Reverse String
---
 problems/reverse-string/reverse_string.go &#124; 8 ++---
 .../reverse-string/reverse_string_test.go &#124; 34 +++++++++++++------
 2 files changed, 27 insertions(+), 15 deletions(-)
diff --git a/problems/reverse-string/reverse_string.go b/problems/reverse-string/reverse_string.go
index 7a5e56484..4e51a7585 100644
--- a/problems/reverse-string/reverse_string.go
+++ b/problems/reverse-string/reverse_string.go
@@ -1,9 +1,7 @@
 package reverse_string
 
-func reverseString(s string) string {
-	runes := []rune(s)
-	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
-		runes[i], runes[j] = runes[j], runes[i]
+func reverseString(s []byte) {
+	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
+		s[i], s[j] = s[j], s[i]
 	}
-	return string(runes)
 }
diff --git a/problems/reverse-string/reverse_string_test.go b/problems/reverse-string/reverse_string_test.go
index 4a9fef60f..bc19da981 100644
--- a/problems/reverse-string/reverse_string_test.go
+++ b/problems/reverse-string/reverse_string_test.go
@@ -1,18 +1,32 @@
 package reverse_string
 
-import "testing"
+import (
+	"reflect"
+	"testing"
+)
+
+type caseType struct {
+	input []byte
+	expected []byte
+}
 
 func TestReverseString(t *testing.T) {
-	tests := map[string]string{
-		"hello, world": "dlrow ,olleh",
-		"你好,世界": "界世,好你",
-		"A man, a plan, a canal: Panama": "amanaP :lanac a ,nalp a ,nam A",
+	tests := [...]caseType{
+		{
+			input: []byte{'h', 'e', 'l', 'l', 'o'},
+			expected: []byte{'o', 'l', 'l', 'e', 'h'},
+		},
+		{
+			input: []byte{'H', 'a', 'n', 'n', 'a', 'h'},
+			expected: []byte{'h', 'a', 'n', 'n', 'a', 'H'},
+		},
 	}
-
-	for input, expected := range tests {
-		output := reverseString(input)
-		if output != expected {
-			t.Fatalf("input: %v, output: %v, expected: %v", input, output, expected)
+	for _, tc := range tests {
+		output := make([]byte, len(tc.input))
+		copy(output, tc.input)
+		reverseString(output)
+		if !reflect.DeepEqual(output, tc.expected) {
+			t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)
 		}
 	}
 }
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