From 320e6d9df8420211e944a39ea12487b804bd8ae5 Mon Sep 17 00:00:00 2001
From: Vishnu Vardhan <123796183+pvcube66@users.noreply.github.com>
Date: Fri, 11 Oct 2024 23:13:56 +0530
Subject: [PATCH 1/2] Add files via upload

---
 Bit-Manipulation/EvenorOdd.js | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Bit-Manipulation/EvenorOdd.js

diff --git a/Bit-Manipulation/EvenorOdd.js b/Bit-Manipulation/EvenorOdd.js
new file mode 100644
index 0000000000..bc6169043d
--- /dev/null
+++ b/Bit-Manipulation/EvenorOdd.js
@@ -0,0 +1,23 @@
+/**
+ *
+ *  This script will check whether a number is even or odd
+ *    using bit manipulation.
+ *  Idea:
+ *  A number can be determined as even or odd by the lsb(least significant bit) or the
+ *  right most bit in binary representation
+ *  if we simply perform an and operation with 1 and the number we can determine:
+ *  eg:
+ *  number & 1 == 1, the number is odd
+ *  number & 1 == 0, the number is even
+ *
+ * More about it :
+ * https://www.geeksforgeeks.org/check-if-a-number-is-odd-or-even-using-bitwise-operators/
+ *
+ */
+
+export const evenOrOdd = (number) => {
+  if (typeof number !== 'number' || !Number.isInteger(number)) {
+    throw new Error('Input must be an integer.')
+  }
+  return number & 1 ? 'odd' : 'even'
+}

From 64d9c705526b232c8e27160e0a44144e1e72dd23 Mon Sep 17 00:00:00 2001
From: Vishnu Vardhan <123796183+pvcube66@users.noreply.github.com>
Date: Fri, 11 Oct 2024 23:15:19 +0530
Subject: [PATCH 2/2] added the test cases for even or odd checker

---
 Bit-Manipulation/test/EvenorOdd.test.js | 39 +++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Bit-Manipulation/test/EvenorOdd.test.js

diff --git a/Bit-Manipulation/test/EvenorOdd.test.js b/Bit-Manipulation/test/EvenorOdd.test.js
new file mode 100644
index 0000000000..a15558f761
--- /dev/null
+++ b/Bit-Manipulation/test/EvenorOdd.test.js
@@ -0,0 +1,39 @@
+import { evenOrOdd } from '../EvenorOdd'
+
+test('check evenOrOdd of 25 is odd', () => {
+  const res = evenOrOdd(25)
+  expect(res).toBe('odd')
+})
+
+test('check evenOrOdd of 36 is even', () => {
+  const res = evenOrOdd(36)
+  expect(res).toBe('even')
+})
+
+test('check evenOrOdd of 0 is even', () => {
+  const res = evenOrOdd(0)
+  expect(res).toBe('even')
+})
+
+test('check evenOrOdd of -13 is odd', () => {
+  const res = evenOrOdd(-13)
+  expect(res).toBe('odd')
+})
+
+test('check evenOrOdd of 4294967295 is odd', () => {
+  const res = evenOrOdd(4294967295)
+  expect(res).toBe('odd')
+})
+
+test('check evenOrOdd of -36 is even', () => {
+  const res = evenOrOdd(-36)
+  expect(res).toBe('even')
+})
+
+test('check evenOrOdd of 21.1 throws error', () => {
+  expect(() => evenOrOdd(21.1)).toThrow()
+})
+
+test('check evenOrOdd of {} throws error', () => {
+  expect(() => evenOrOdd({})).toThrow()
+})