const nodes = new Array(5).fill(null).map((_, i) => LinkNode.create(i));
for (let i = 0, len = nodes.length; i < len; i++) {
    const currentNode = nodes[i];
    const prevNode = nodes[(i - 1 + len) % len];
    currentNode.prevNode = prevNode;
    prevNode.nextNode = currentNode;
}

class LinkNode {
    static create(val: number) {
        const node = new LinkNode(val);
        return node;
    }

    private _value: number;
    private _nextNode: LinkNode | null;
    private _prevNode: LinkNode | null;
    private constructor(val: number) {
        this.value = val;
        this.nextNode = null;
        this.prevNode = null;
    }

    set value(val: number) {
        this._value = val;
    }
    get value() {
        return this._value;
    }

    set nextNode(nextNode: LinkNode | null) {
        this._nextNode = nextNode;
    }
    get nextNode() {
        return this._nextNode;
    }

    set prevNode(prevNode: LinkNode | null) {
        this._prevNode = prevNode;
    }
    get prevNode() {
        return this._prevNode;
    }
}