algorithm: reverse (TheAlgorithms#1197)

SczSca · web-flow · commit 636017ca51da · 2022-10-20T17:08:56.000+05:30
diff --git a/Data-Structures/Array/Reverse.js b/Data-Structures/Array/Reverse.js
@@ -0,0 +1,17 @@
+/** https://www.geeksforgeeks.org/write-a-program-to-Reverse-an-array-or-string/
+ * This function will accept an array and
+ * Reverse its elements and returns the inverted array
+ * @param {Array} arr array with elements of any data type
+ * @returns {Array} array with inverted elements
+ */
+
+const Reverse = (arr) => {
+  // limit specifies the amount of Reverse actions
+  for (let i = 0, j = arr.length - 1; i < arr.length / 2; i++, j--) {
+    const temp = arr[i]
+    arr[i] = arr[j]
+    arr[j] = temp
+  }
+  return arr
+}
+export { Reverse }
diff --git a/Data-Structures/Array/test/Reverse.test.js b/Data-Structures/Array/test/Reverse.test.js
@@ -0,0 +1,13 @@
+import { Reverse } from '../Reverse.js'
+import each from 'jest-each'
+
+describe('reverse elements in an array', () => {
+  each`
+  array | expected
+  ${[]} | ${[]}
+  ${[1]} | ${[1]}
+  ${[1, 2, 3, 4]} | ${[4, 3, 2, 1]}
+  `.test('returns $expected when given $array', ({ array, expected }) => {
+      expect(Reverse(array)).toEqual(expected)
+    })
+})
