color.js

(function () {
    'use strict';

    var colorList = [
            '#da1f2d',
            '#00a550',
            '#00acdc',
            '#f37720',
            '#fbaf17',
            '#5c5da9',
            '#c74398',
            '#00ae9d',
            '#085866',
            '#3d5958',
            '#8cc63e',
            '#633a1c'
        ],
        colorCache = {},
        colorIndex = 0;


    function clearKeyAndColorCache() {
        colorCache = {};
    }

    function getAndCreateColorForKey(authorId) {
        if (colorCache.hasOwnProperty(authorId) === false) {
            colorCache[authorId] = colorList[colorIndex];

            if (colorList.length - 1 === colorIndex) {
                colorIndex = 0;
            } else {
                colorIndex += 1;
            }
        }

        return colorCache[authorId];
    }

    module.exports = {
        clearKeyAndColorCache: clearKeyAndColorCache,
        getAndCreateColorForKey: getAndCreateColorForKey
    };
}());