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Author: pvcube66

Bit-Manipulation/EvenorOdd.js

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+/**
+ *
+ *  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'
+}