Нужно больше функций

index.html

@@ -234,5 +234,6 @@ <h2 class="data-error__title">Не удалось загрузить данны
       </section>
     </template>
 
+  <script src="/js/functions.js"></script>
 </body>
 </html>

js/functions.js

@@ -0,0 +1,24 @@
+function isLesserOrEqual(string, maxLength) {
+  return string.length <= maxLength;
+}
+
+function isPalindrome(string) {
+  const normalizedString = string.replaceAll(' ', '').toLowerCase();
+  const reversedString = normalizedString.split('').reverse().join('');
+
+  return normalizedString === reversedString;
+}
+
+function toPositiveNumber(string) {
+  const normalizedString = string.toString().replaceAll(' ', '');
+  let result = '';
+
+  for (let i = 0; i < normalizedString.length; i++) {
+    if(!isNaN(Number(normalizedString[i]))) {
+      result += normalizedString[i];
+    }
+  }
+
+  return parseInt(result, 10);
+}
+