Node-REDを使ってみる　その３（ui-tableノード、emailノード）

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let queue = flow.get("queue") || [];
msg.dequeued = ''

// 操作の種類をチェック（msg.topicを使用）
switch (msg.topic) {
    case "enqueue": // データを追加
        queue.push(msg.payload);
        break;

    case "dequeue": // データを削除
        if (queue.length > 0) {
            let dequeuedItem = queue.shift(); // 先頭を削除
            msg.dequeued = dequeuedItem;     // 削除した要素を返す
        }
        break;

    case "clear": // キューをクリア
        queue = [];
        break;

    default:
        node.warn("サポートされていない操作です: " + msg.topic);
}

// キューを更新
flow.set("queue", queue);

// 現在のキューを出力
msg.queue = queue;
return msg;

let queue = flow.get("queue") || [];

msg.payload = queue.map((item, index) => ({ index: index + 1, value: item }));

return msg;