Convert Hex to RGBA

Question

My fiddle - http://jsbin.com/pitu/1/edit

I wanted to try an easy hex to rgba conversion. Ever browser I\'ve used renders colors using rgb as default so when using th

Answer 1

Here's an ES2015+ version that's a little more defensive and handles the shorthand 3-digit syntax.

/*
 * Takes a 3 or 6-digit hex color code, and an optional 0-255 numeric alpha value
 */
function hexToRGB(hex, alpha) {
  if (typeof hex !== 'string' || hex[0] !== '#') return null; // or return 'transparent'

  const stringValues = (hex.length === 4)
        ? [hex.slice(1, 2), hex.slice(2, 3), hex.slice(3, 4)].map(n => `${n}${n}`)
        : [hex.slice(1, 3), hex.slice(3, 5), hex.slice(5, 7)];
  const intValues = stringValues.map(n => parseInt(n, 16));

  return (typeof alpha === 'number')
    ? `rgba(${intValues.join(', ')}, ${alpha})`
    : `rgb(${intValues.join(', ')})`;
}