Create a Hex Color

/**
 * Create a random color value.
 * @return {String} A random six-digit color hexcode
 */
function createColor () {
    // The available hex options
    let hex = ['a', 'b', 'c', 'd', 'e', 'f', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];

    /**
     * Randomly shuffle an array
     * https://stackoverflow.com/a/2450976/1293256
     */
    let shuffle = function () {
        let currentIndex = hex.length;
        let temporaryValue, randomIndex;

        // While there remain elements to shuffle...
        while (0 !== currentIndex) {
            // Pick a remaining element...
            randomIndex = Math.floor(Math.random() * currentIndex);
            currentIndex -= 1;

            // And swap it with the current element.
            temporaryValue = hex[currentIndex];
            hex[currentIndex] = hex[randomIndex];
            hex[randomIndex] = temporaryValue;
        }
    };

    /**
     * Create a six-digit hex color
     */
    let hexColor = function () {
        // Create the color
        let color = '#';

        // Shuffle the hex values and append
        for (let i = 0; i < 6; i++) {
            shuffle(hex);
            color += hex[0];
        }

        return color;
    };

    // Return the color string
    return hexColor();
}