Elegant Error Handling Code Samples

csv-to-messages-03.js

function csvToMessages(csvData) {
    const csvRows      = splitCSVToRows(csvData);
    const headerFields = csvRows.map(_.head).map(splitFields);
    const dataRows     = csvRows.map(_.tail);
    const funcInEither = headerFields.map(processRows);
    const messagesArr  = dataRows.ap(funcInEither);
    return either(showError, showMessages, messagesArr);
}