palindrome number

palindromenumber/palindromenumber.go

@@ -0,0 +1,18 @@
+package palindromenumber
+
+import "strconv"
+
+func isPalindrome(x int) bool {
+	str := strconv.Itoa(x)
+	for i, digit := range str {
+		if byte(digit) != str[len(str)-i-1] {
+			return false
+		}
+	}
+	return true
+}
+
+// public for test
+func IsPalindrome(x int) bool {
+	return isPalindrome(x)
+}

palindromenumber/palindromenumber_test.go

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+package palindromenumber_test
+
+import (
+	"strconv"
+	"testing"
+
+	"git.jxs.me/leetgo/palindromenumber"
+)
+
+func TestCases(t *testing.T) {
+	cases := map[int]bool{
+		0:    true,
+		10:   false,
+		11:   true,
+		100:  false,
+		101:  true,
+		-121: false,
+	}
+
+	for input, expected := range cases {
+		t.Run(strconv.Itoa(input), func(t *testing.T) {
+			result := palindromenumber.IsPalindrome(input)
+
+			if expected != result {
+				t.Errorf("%v != %v", expected, result)
+			}
+		})
+	}
+
+}

palindromenumber/readme.md

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+Given an integer x, return true if x is palindrome integer.
+
+An integer is a palindrome when it reads the same backward as forward.
+
+    For example, 121 is a palindrome while 123 is not.
+
+ 
+
+Example 1:
+
+Input: x = 121
+Output: true
+Explanation: 121 reads as 121 from left to right and from right to left.
+
+Example 2:
+
+Input: x = -121
+Output: false
+Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
+
+Example 3:
+
+Input: x = 10
+Output: false
+Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
+
+ 
+
+Constraints:
+
+    -231 <= x <= 231 - 1
+
+
+https://leetcode.com/problems/palindrome-number/