little example of a double linkedList

doubleLinkedList.js

const uuid = require('uuid/v1');

export default class DoubleLinkedList {
    list;
    currentItemId;

    constructor(items) {
        this.setList(items);
    }

    setList = items => {
        let prevId = null;
        let nextId = null;
        let currentId = null;
        this.list = items.map((item, i) => {
            prevId = currentId;
            currentId = nextId ? nextId : uuid();
            nextId = i + 1 == items.length ? null : uuid();
            return {
                id: currentId,
                prevId: prevId,
                nextId: nextId,
                item: item,
            };
        });

        if (this.list[0] !== undefined) {
            this.currentItemId = this.list[0].id;
        }
    };

    getCurrent = () => {
        return this.findById(this.currentItemId);
    };

    setCurrentToNext = () => {
        const currentItem = this.getCurrent();
        this.currentItemId = currentItem.nextId ? currentItem.nextId : this.currentItemId;
    };

    setCurrentToPrev = () => {
        const currentItem = this.getCurrent();
        this.currentItemId = currentItem.prevId ? currentItem.prevId : this.currentItemId;
    };

    findById = id => {
        return this.list.find(i => i.id == id);
    };

    getList = () => {
        return this.list;
    };

    setCurrentById = id => {
        this.currentItemId = id;
    };

    setCurrentToFirst = () => {
        if (this.list[0] !== undefined) {
            this.currentItemId = this.list[0].id;
        }
    };
}