Add BitwiseParityCheck.js

Bit-Manipulation/BitwiseParityCheck.js

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+/*
+ author: Hardvan
+
+ This script will check whether the given
+ number is even parity or odd parity.
+
+ Even parity is a property of binary numbers,
+ where the total number of 1-bits in a number
+ is even or odd.
+
+ Reference link: https://en.wikipedia.org/wiki/Parity_bit
+
+ If we will right shift the number by 1 bit
+ and XOR it with the original number, the
+ result will be 0 if the number has even parity
+ and 1 if the number has odd parity.
+
+*/
+export const checkEvenParity = (number) => {
+ let count = 0
+ while (number > 0) {
+ count ^= number & 1 // XOR operation to count set bits
+ number >>= 1 // Right shift to check the next bit
+ }
+ return count === 0 // Even parity if count is 0
+}
+
+export const checkOddParity = (number) => {
+ return !checkEvenParity(number) // Odd parity is the opposite of even parity
+}

Bit-Manipulation/test/BitwiseParityCheck.test.js

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+import { checkEvenParity, checkOddParity } from '../BitwiseParityCheck'
+
+// Test cases for checkEvenParity
+describe('checkEvenParity', () => {
+ it('should return true for a binary number with even parity', () => {
+ const binaryNumber = parseInt('1101100', 2) // Even parity binary number
+ const result = checkEvenParity(binaryNumber)
+ expect(result).toBe(true)
+ })
+
+ it('should return false for a binary number with odd parity', () => {
+ const binaryNumber = parseInt('1101101', 2) // Odd parity binary number
+ const result = checkEvenParity(binaryNumber)
+ expect(result).toBe(false)
+ })
+
+ it('should return true for a binary number with all bits set to 0', () => {
+ const binaryNumber = 0 // All bits set to 0
+ const result = checkEvenParity(binaryNumber)
+ expect(result).toBe(true)
+ })
+
+ // Add more test cases as needed
+})
+
+// Test cases for checkOddParity
+describe('checkOddParity', () => {
+ it('should return true for a binary number with odd parity', () => {
+ const binaryNumber = parseInt('1101101', 2) // Odd parity binary number
+ const result = checkOddParity(binaryNumber)
+ expect(result).toBe(true)
+ })
+
+ it('should return false for a binary number with even parity', () => {
+ const binaryNumber = parseInt('1101100', 2) // Even parity binary number
+ const result = checkOddParity(binaryNumber)
+ expect(result).toBe(false)
+ })
+
+ it('should return true for a binary number with all bits set to 0', () => {
+ const binaryNumber = 0 // All bits set to 0
+ const result = checkEvenParity(binaryNumber)
+ expect(result).toBe(true)
+ })
+})