createColor.js

/*!
 * Create a random color value.
 * (c) 2021 Chris Ferdinandi, MIT License, https://gomakethings.com
 * @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();

}