Hex to RGB

Giovanny Gongora

Converts a color code to an rgb() or rgba() string if alpha value is provided.

const hexToRGB = (hex: string) => {
  let alpha = false,
    h: string = hex.slice(hex.startsWith('#') ? 1 : 0);
  if (h.length === 3) h = [...h].map(x => x + x).join('');
  else if (h.length === 8) alpha = true;
  let hn: number = parseInt(h, 16);
  return (
    'rgb' +
    (alpha ? 'a' : '') +
    '(' +
    (hn >>> (alpha ? 24 : 16)) +
    ', ' +
    ((hn & (alpha ? 0x00ff0000 : 0x00ff00)) >>> (alpha ? 16 : 8)) +
    ', ' +
    ((hn & (alpha ? 0x0000ff00 : 0x0000ff)) >>> (alpha ? 8 : 0)) +
    (alpha ? `, ${hn & 0x000000ff}` : '') +
    ')'
  );
};