Added: reverse string

Author: Mqxx

src/format/reverse_string.test.ts

@@ -0,0 +1,27 @@
+import { assertEquals } from 'https://deno.land/std@0.203.0/assert/assert_equals.ts';
+import reverseString from './reverse_string.ts';
+
+Deno.test(
+  'Reverse a string.',
+  async (test) => {
+    await test.step({
+      name: 'Empty string',
+      fn: () => {
+        assertEquals(
+          reverseString(''),
+          '',
+        );
+      },
+    });
+
+    await test.step({
+      name: 'Normal string',
+      fn: () => {
+        assertEquals(
+          reverseString('abc'),
+          'cba',
+        );
+      },
+    });
+  },
+);

src/format/reverse_string.ts

@@ -0,0 +1,12 @@
+/**
+ * This function reverses a string.
+ * 
+ * @param inputString The string to reverse
+ * @returns The reversed string
+ */
+export default function reverseString(inputString : string) : string {
+  if (!inputString || inputString.length === 1) {
+    return inputString;
+  }
+  return inputString.split('').reverse().join('');
+}