nodbot/CustomModules/Indexer.js

module.exports = (collection, page, qty) => {
    const itemsPerPage = qty ? qty : 10;
    const index = page * itemsPerPage;
    const totalPages = Math.ceil(collection.size / itemsPerPage);
    let state = page === 0 ? 'first' : 'middle';

    const thisPage = new Array();

    // Map the Djs Collection to an Array
    const collectionArray = collection.map((command) => command);

    for (let i = index; i < index + itemsPerPage; i++) {
        if (collectionArray[i]) {
            thisPage.push(collectionArray[i]);
        } else { 
            state = 'last';
            break;
        }

        if (i === collectionArray.size - 1) {
            state = 'last';
            break;
        }
    }

    return {
        state: state,
        thisPage: thisPage,
        totalPages: totalPages,
        pagesString: `${page + 1}/${totalPages}`
    };
}