Method keys

packages/joint-core/src/alg/Deque.mjs:15–23

()

    // Return an array of keys in the deque
    keys() {
        let current = this.head;
        const keys = [];
        while (current) {
            keys.push(current.key);
            current = current.next;
        }
        return keys;
    }

    // Return the first node and remove it from the deque
    popHead() {