DCC-27.js

// Prompt:

// - Write a function called countTheBits that accepts a single numeric argument that will be an integer.
// - The function should return the number of bits that are set to 1 in the number's binary representation.

// Hints:

// - We typically work with "decimal" numbers on a daily basis. Decimal is "base 10", where there are 10 digits available - 0 thru 9.  However, it's binary that computers understand - 1's and 0's.  The 1's and 0's are called bits.
// - As an example, the decimal value of 13 is represented in binary as 1101.  There are 3 one bits and 1 zero bit in the decimal number of 13.
// - Carefully read the documentation for the Number.prototype.toString method.

// Examples:

// countTheBits( 0 ) // => 0
// countTheBits( 13 ) // => 3
// countTheBits( 256 ) // => 1
// countTheBits( 255 ) //=> 8
// countTheBits( 65535 )  //=> 16

const countTheBits = (num) => {
	const binaryString = num.toString(2);
	return (binaryString.match(/1/g) || []).length;
};