This method checks if a number provided is power of two. It uses the property that when

a power of 2 is `&` with power of 2 minus 1, it would return 0 implying that the provided

number is power of 2.

This method multiplies two integer numbers using bitwise operators.

This method checks if a number provided is power of two. It uses the following

property. Let's say that `powerNumber` is a number that has been formed as a power

of two (i.e. 2, 4, 8, 16 etc.). Then if we'll do `&` operation between `powerNumber`

and `powerNumber - 1` it will return `0` (in case if number is power of two).

import isPowerOfTwo from '../isPowerOfTwo';

describe('isPowerOfTwo', () => {

it('should detect if the number is power of two', () => {

expect(isPowerOfTwo(1)).toBe(true);

expect(isPowerOfTwo(2)).toBe(true);

expect(isPowerOfTwo(3)).toBe(false);

expect(isPowerOfTwo(4)).toBe(true);

expect(isPowerOfTwo(5)).toBe(false);

expect(isPowerOfTwo(6)).toBe(false);

expect(isPowerOfTwo(7)).toBe(false);

expect(isPowerOfTwo(8)).toBe(true);

expect(isPowerOfTwo(9)).toBe(false);

expect(isPowerOfTwo(16)).toBe(true);

expect(isPowerOfTwo(23)).toBe(false);

expect(isPowerOfTwo(32)).toBe(true);

expect(isPowerOfTwo(127)).toBe(false);

expect(isPowerOfTwo(128)).toBe(true);

});

export default function isPowerOfTwo(number) {

return (number & (number - 1)) === 0;