Task 6: Check string palindrome

.gitignore

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+node_modules/
+.DS_Store

src/utils/palindrome.js

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+/**
+ * Author: Chris Newell
+ * Date: 18 January 2026
+ * File: palindrome.js
+ * Description: This script checks whether a string is a palindrome
+ */
+'use strict';
+
+// The isPalindrome function checks if a string reads the same forward and backward
+function isPalindrome(str) {
+  if (typeof str !== 'string') {
+    throw new Error('Input must be a string');
+  }
+
+  // Normalize: lowercase and remove non-alphanumeric characters
+  const normalized = str.toLowerCase().replace(/[^a-z0-9]/g, '');
+  const reversed = normalized.split('').reverse().join('');
+
+  return normalized === reversed;
+}
+
+module.exports = { isPalindrome };

test/utils/palindrome.spec.js

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+/**
+ * Author: Chris Newell
+ * Date: 18 January 2026
+ * File: palindrome.spec.js
+ * Description: This script tests the isPalindrome function.
+ */
+'use strict';
+
+const { isPalindrome } = require('../../src/utils/palindrome');
+
+describe('palindrome.js', () => {
+  it('should return true for a simple palindrome', () => {
+    expect(isPalindrome('racecar')).toBe(true);
+  });
+
+  it('should ignore case and non-alphanumeric characters', () => {
+    expect(isPalindrome('A man, a plan, a canal: Panama')).toBe(true);
+  });
+
+  it('should return false when the string is not a palindrome', () => {
+    expect(isPalindrome('hello')).toBe(false);
+  });
+});