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

title, tags

title	tags
isPowerOfTwo	math,beginner

Returns true if the given number is a power of 2, false otherwise.

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