getComments = function(cell) {
    const obj = this;

    if (cell) {
        if (typeof(cell) !== 'string') {
            return getComments.call(obj);
        }

        cell = getIdFromColumnName(cell, true);

        return obj.records[cell[1]][cell[0]].element.getAttribute('title') || '';
    } else {
        const data = {};
        for (let j = 0; j < obj.options.data.length; j++) {
            for (let i = 0; i < obj.options.columns.length; i++) {
                const comments = obj.records[j][i].element.getAttribute('title');
                if (comments) {
                    const cell = getColumnNameFromId([i, j]);
                    data[cell] = comments;
                }
            }
        }
        return data;
    }
}
Get cell comments, null cell for all