aureooms/js-skip-list

import Node from './Node.js';

const makeBottomLevel = (compare, iterable) => {
    const sorted = [...iterable].sort(compare);
    const bottomLevelHead = new Node();
    let current = bottomLevelHead;
    for (const key of sorted) {
        current = new Node(key, null, current);
        current.left.right = current;
    }

    return bottomLevelHead;
};

export default makeBottomLevel;