Let’s say you have the following hexadecimal as a string:

var hex = 'BADA55';

How can you convert it to its equivalent RGB value?

With parseInt(), you can convert every two characters to its base 16 form:

var BASE = 16;
var r = parseInt(hex.slice(0, 2), BASE);
var g = parseInt(hex.slice(2, 4), BASE);
var b = parseInt(hex.slice(4, 6), BASE);

Then you can simply concatenate them together:

var rgb = 'rgb(' + [r, g, b].join(',') + ')';

hexToRGB()

Here’s a function written in ES5:

var BASE = 16;
function hexToRGB(hex) {
  var rgb = '', start = 0, len = hex.length;
  for (; start < len; start += 2) {
    rgb += parseInt(hex.slice(start, start + 2), BASE);
  }
  return 'rgb(' + rgb + ')';
}

And an alternative function written in ES6:

const BASE = 16;
const hexToRGB = (hex) => {
  const rgb = [0, 2, 4].map((start) => {
    return parseInt(hex.slice(start, start + 2), BASE);
  });
  return `rgb(${rgb.join(',')})`;
}