30-seconds-of-code/snippets/isPowerOfTwo.md

title, tags, firstSeen, lastUpdated

title	tags	firstSeen	lastUpdated
isPowerOfTwo	math,beginner	2019-12-31T13:17:12+02:00	2020-10-20T23:02:01+03:00

Checks if the given number is a power of 2.

• Use the bitwise binary AND operator (&) to determine if n is a power of 2.
• Additionally, check that n is not falsy.

const isPowerOfTwo = n => !!n && (n & (n - 1)) == 0;

isPowerOfTwo(0); // false
isPowerOfTwo(1); // true
isPowerOfTwo(8); // true