From c8390c584fa3e5d3c1d8fd7b0aec86d66cfa1d5e Mon Sep 17 00:00:00 2001
From: Bauke <me@bauke.xyz>
Date: Wed, 6 Apr 2022 14:31:30 +0200
Subject: [PATCH] Solve palindrome-number.

---
 source/lib.rs                   |  1 +
 source/palindrome_number/mod.rs | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 source/palindrome_number/mod.rs

diff --git a/source/lib.rs b/source/lib.rs
index 9823fe9..1b37410 100644
--- a/source/lib.rs
+++ b/source/lib.rs
@@ -1,2 +1,3 @@
+pub mod palindrome_number;
 pub mod reverse_integer;
 pub mod two_sum;
diff --git a/source/palindrome_number/mod.rs b/source/palindrome_number/mod.rs
new file mode 100644
index 0000000..799d715
--- /dev/null
+++ b/source/palindrome_number/mod.rs
@@ -0,0 +1,23 @@
+pub fn is_palindrome(number: i32) -> bool {
+  // Negative numbers can never be a palindrome because of the minus sign.
+  if number < 0 {
+    return false;
+  }
+
+  let number_string = number.to_string();
+  number_string == number_string.chars().rev().collect::<String>()
+}
+
+#[test]
+fn test_palindrome_number() {
+  assert!(is_palindrome(0));
+  assert!(is_palindrome(-0));
+  assert!(is_palindrome(1));
+  assert!(is_palindrome(121));
+  assert!(is_palindrome(12321));
+
+  assert!(!is_palindrome(123));
+  assert!(!is_palindrome(321));
+  assert!(!is_palindrome(10));
+  assert!(!is_palindrome(-121));
+}