wouterbulten/slacjs

class LinkedList {
    /**
     * Create a new linked linst
     * @param  {LinkedList} base The previous link
     * @return LinkedList
     */
    constructor(base = undefined) {
        if (base !== undefined && typeof base != 'object') {
            console.error('Base must be a LinkedList');
        }

        this.list = [base];
    }

    add(element) {
        this.list.push(element);

        return this;
    }

    /**
     * Return a flat array of the linked list
     * @return {Array}
     */
    values() {
        let values = [];

        //First element of the list is another list or undefined
        if (this.list[0] !== undefined) {
            values = this.list[0].values();
        }

        values = values.concat(this.list.slice(1));

        return values;
    }

    /**
     * Only return the elements of this list and not of its parents
     * @return {Array}
     */
    currentValues() {
        return this.list.slice(1);
    }

    /**
     * Return true when this parent has a parent list
     * @return {Boolean}
     */
    hasParent() {
        return this.list[0] !== undefined;
    }

    /**
     * Return the last object in the list
     * @return {mixed}
     */
    last() {
        return this.list[this.list.length - 1];
    }

    /**
     * Return the base of this linked list
     * @return {undefined|LinkedList}
     */
    getBase() {
        return this.list[0];
    }
}

export default LinkedList;