bot.js

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

const { ActivityHandler, MessageFactory, CardFactory } = require('botbuilder');
function shuffle (arra1) {
    var ctr = arra1.length, temp, index;

    // While there are elements in the array
    while (ctr > 0) {
        // Pick a random index
        index = Math.floor(Math.random() * ctr);
        // Decrease ctr by 1x
        ctr--;
        // And swap the last element with it
        temp = arra1[ctr];
        arra1[ctr] = arra1[index];
        arra1[index] = temp;
    }
    return arra1;
}


class EchoBot extends ActivityHandler {
    constructor () {
        super();
        // See https://aka.ms/about-bot-activity-message to learn more about the message and other activity types.
        this.onMessage(async (context, next) => {
            const replyText = `Echo: ${context.activity.text}`;
            let myArray = ['Abhisek', "Hari", "Vishnu", "Sudheer", "Shashank", "Saurabh", 'Snigdha'];
            let transformedArray = shuffle(myArray);
            transformedArray.push('Mahesh')
            transformedArray.push('Sandeep')

            await context.sendActivity(MessageFactory.list(
                transformedArray.map(item =>
                    CardFactory.heroCard(item)
                )))
            // By calling next() you ensure that the next BotHandler is run.
            await next();
        });

        this.onMembersAdded(async (context, next) => {
            const membersAdded = context.activity.membersAdded;
            const welcomeText = 'Hello and welcome!';
            for (let cnt = 0; cnt < membersAdded.length; ++cnt) {
                if (membersAdded[cnt].id !== context.activity.recipient.id) {
                    await context.sendActivity(MessageFactory.text(welcomeText, welcomeText));
                }
            }
            // By calling next() you ensure that the next BotHandler is run.
            await next();
        });
    }
}

module.exports.EchoBot = EchoBot;