Persistent Configurations for user browser-based options persistence

persistent-config.js

/** 
 * Store configurations in the localStorage (HTML5 compatible browsers only)
 * so the user does not have to set basic options every time the browser are reloaded
 */
var PersistentConfig = {

	/**
	 * The namespace prefix that will be applied to all storage keys, so all persistent config are kept on 
	 * the same namespace
	 */
	prefix: "persistentconfig_",

	/**
	 * Return a new string with the prefixed namespace included
	 */
	applyPrefix: function (key) {
		return this.prefix + key;
	},

	/**
	 * Return the stored configuration with the name `key` or `default_value` if not found or browser is not compatible
	 */
	get: function (key, default_value) {
		return localStorage.getItem(this.applyPrefix(key)) || default_value;
	},

	/**
	 * Store the configuration
	 */
	set: function (key, value) {
		return localStorage.setItem(this.applyPrefix(key), value);
	}
};