Store data as an single item in the local storage.

storage.js

/**
 * Store data as an single item in the local storage.
 * 
 * @author Tobias Röder
 * @version 1.0.0
 *
 * @property reck
 * @property itemName
 *
 * @method init
 * @method get
 * @method add
 * @method remove
 * @method flush
 * @method destroy
 */
const storage = {
    /**
     * @var Object
     */
    reck: {},
    /**
     * @var String
     */
    itemName: '',

    /**
     * Initialize the storage.
     *
     * @param {String} itemName The name (identifier) of the item in the local storage.
     *
     * @this storage
     */
    init(itemName = 'heimkino') {
        this.itemName = itemName;

        if (localStorage.getItem(itemName) !== null) {
            this.reck = JSON.parse(localStorage.getItem(itemName));

            return this;
        }

        let initValue = {};
        localStorage.setItem(itemName, JSON.stringify(initValue));

        return this;
    },

    /**
     * Save the reck in the local storage.
     *
     * @private
     */
    save() {
        localStorage.setItem(this.itemName, JSON.stringify(this.reck));
    },

    /**
     * Get the value from an item of the reck.
     *
     * @param {String} key The key from the reck.
     * @param {*} fallback Returns this fallback if the key does not exists.
     *
     * @returns {*} Returns the value on success, otherwise null.
     */
    get(key, fallback = null) {
        return this.reck[key] ?? fallback;
    },

    /**
     * Add item to the reck.
     *
     * @param {String} key The key from the reck.
     * @param {*} value The value.
     *
     * @this storage
     */
    add(key, value) {
        this.reck[key] = value;
        this.save();

        return this;
    },

    /**
     * Remove an item of the reck.
     *
     * @param {String} key The key from the reck.
     *
     * @this storage
     */
    remove(key) {
        delete this.reck[key];
        this.save();

        return this;
    },

    /**
     * Clear the local storage item.
     *
     * @this storage
     */
    flush() {
        this.reck = {};
        this.save();

        return this;
    },

    /**
     * Remove the local storage item.
     *
     * @this storage
     */
    destroy() {
        localStorage.removeItem(this.itemName);

        return this;
    },
};

export default storage;