Create palindrome.dart

strings/palindrome.dart

@@ -0,0 +1,85 @@
+import 'package:test/test.dart';
+
+void main() {
+  palindrome();
+}
+
+void palindrome() {
+  print('Enter Words or number');
+  // User enter a string or a number
+  String original = 'hannah';
+
+  // then we will reverse the input
+  String reverseUsingLoop = reverseStringUsingLoop(original);
+  String reverseUsingSplit = reverseStringUsingSplit(original);
+  String reverseUsingRunes = reverseStringUsingRunes(original);
+  String reverseUsingCodeUnits = reverseStringUsingCodeUnits(original);
+
+  // then we will compare (Use any one of the four)
+  if (original == reverseUsingLoop) {
+    // print('Its A Palindrome');
+  } else {
+    // print('Its A Not Palindrome');
+  }
+
+  if (original == reverseUsingSplit) {
+    // print('Its A Palindrome');
+  } else {
+    // print('Its A Not Palindrome');
+  }
+
+  if (original == reverseUsingRunes) {
+    // print('Its A Palindrome');
+  } else {
+    // print('Its A Not Palindrome');
+  }
+
+  if (original == reverseUsingCodeUnits) {
+    // print('Its A Palindrome');
+  } else {
+    // print('Its A Not Palindrome');
+  }
+
+  // test
+  group('Palindrome Check', () {
+    test('Using loop to reverse a string.', () {
+      var string = 'hannah';
+      expect(string, equals(reverseStringUsingLoop(string)));
+    });
+    test('Using split to reverse a string.', () {
+      var string = 'hannah';
+      expect(string, equals(reverseStringUsingSplit(string)));
+    });
+    test('Using runes to reverse a string.', () {
+      var string = 'hannah';
+      expect(string, equals(reverseStringUsingRunes(string)));
+    });
+    test('Using code units to reverse a string.', () {
+      var string = 'hannah';
+      expect(string, equals(reverseStringUsingCodeUnits(string)));
+    });
+  });
+}
+
+String reverseStringUsingLoop(String input) {
+  String reversed = "";
+  for (int index = input.length - 1; index >= 0; index--) {
+    reversed += input[index];
+  }
+  return reversed;
+}
+
+String reverseStringUsingSplit(String input) {
+  var chars = input.split('');
+  return chars.reversed.join();
+}
+
+String reverseStringUsingRunes(String input) {
+  var chars = input.runes.toList();
+
+  return String.fromCharCodes(chars.reversed);
+}
+
+String reverseStringUsingCodeUnits(String input) {
+  return String.fromCharCodes(input.codeUnits.reversed);
+}