Check if number is already power of two

Bit-Manipulation/NextPowerOfTwo.js

@@ -2,10 +2,13 @@
  *
  *  This script will find next power of two
  *    of given number.
+ *  More about it:
+ *   https://www.techiedelight.com/round-next-highest-power-2/
  *
  */
 
 export const nextPowerOfTwo = (n) => {
+  if (n > 0 && (n & (n - 1)) === 0) return n
   let result = 1
   while (n > 0) {
     result = result << 1