(JS) Convert short color hex to pair

If you have a three digit hex for a color. For example #FFF and want to convert it to a 6 digit number here’s a simple way:

//  Expects 3 digit hex, like '#FFF';
function uniformColorHex(hex) {

    var newHex = '#' +
        hex.charAt(1) +
        hex.charAt(1) +
        hex.charAt(2) +
        hex.charAt(2) +
        hex.charAt(3) +
        hex.charAt(3);

    console.log(hex + ' => ' + newHex);
    return newHex;
}