Google App Script pop all emails from a Gmail Label

read_labeled_email.gs

/**
 * label: gmail label to be read
**/
function readGmailLabel(label) {

    var emails = [];
    var label = GmailApp.getUserLabelByName(label);
    var threads = label.getThreads();
    for (var j = threads.length - 1; j >= 0; j--) {
        emails.push({
            body: threads[j].getMessages()[0].getPlainBody(),
            date: threads[j].getMessages()[0].getDate()
        });
    }
    label.removeFromThreads(threads);
    return emails;
}