NodeBB/NodeBB

'use strict';

const helpers = module.exports;

helpers.mergeBatch = function (batchData, start, stop, sort) {
    function getFirst() {
        let selectedArray = batchData[0];
        for (let i = 1; i < batchData.length; i++) {
            if (batchData[i].length && (
                !selectedArray.length ||
                (sort === 1 && batchData[i][0].score < selectedArray[0].score) ||
                (sort === -1 && batchData[i][0].score > selectedArray[0].score)
            )) {
                selectedArray = batchData[i];
            }
        }
        return selectedArray.length ? selectedArray.shift() : null;
    }
    let item = null;
    const result = [];
    do {
        item = getFirst(batchData);
        if (item) {
            result.push(item);
        }
    } while (item && (result.length < (stop - start + 1) || stop === -1));
    return result;
};