RGB to HEX and HEX to RGB color conversion in Javascript - using shift operators

rgbHexConversion.js

function rgbToHex([red = 0, green = 0, blue = 0] = []) {
	// Left shift (<<)  operator for color conversion is interesting
	// the color value for each component of an RGB color is between 0 - 255 (8bits)
	// The first 8 bits starting from the right will represent the blue component, 
	// the next 8 bits will represent the green component, and the 8 bits after that will represent the red component
	return `#${(red << 16 | green << 8 | blue).toString(16)}`;
}
function hexToRgb(hex) {
	// working through above shift operator procedure backwards
	// we will right-shift the color bits by multiples of 8 as necessary until
	// we get the target component bits as the first 8 bits from the right
	hex = hex.replace(/^#?([0-9a-f]{6})$/i, '$1');
	hex = Number(`0x${hex}`);
	// we need a way to mask out every other bits except the first 8 bits.
	// & operator can be used to ensure that certain bits are turned off.
	return [
		hex >> 16 & 0xff, // red
		hex >> 8 & 0xff,  // green
		hex & 0xff        // blue
	];
}