Welcome bot

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Welcome bot
This bot greeting all new members in chat and say "Good morning" every day.
Good morning every day
We use Auto Retry for this. Every 50 minutes we check time. If current hour is 6 AM - bot send greeting message to all chat.
Auto retry run periodically.
We have 50 minutes - so we iterate every hour without repeating.
Set 3000 to Auto Retry:
Users can not run this command.
Bot send message to ALL chats. If user run this command at 6 AM - bot send message too! 
We need check for auto retry only. Auto Retry do not have chat variable. Execution breaks if chat exist.
// can be runned with Auto Retry only!
if(chat){ return }
Then other code:
let time = new Date()
let hours = time.getHours();
let minutes = time.getMinutes();
​
curTime = "Time: " + hours + ":" + minutes + " GMT-0";
msg = "";
​
if(hours==6){
  msg = "Good morning!\n" + curTime;
}
​
Bot.sendMessageToAllChats(msg);
​
Greeting all new member
We use Master commad "*" for this. it capture all messages.
Request can have information about new members:
let new_members = request.new_chat_members;
We need build greetings for all users:
if(new_members.length > 0){
   for(var i=0; i<new_members.length; i++){
      msg = msg + comma + getNameFor(new_members[i])
      comma = ", ";
   }
   Bot.sendMessage(msg);
}
User can have username or first name. Or have not:
function getNameFor(member){
   let haveAnyNames = member.username&&member.first_name;
   if(!haveAnyNames){ return ""}
​
   return member.username ? ("@" + member.username) : member.first_name
}
​
All code: 
let new_members = request.new_chat_members;
let msg = "Hello, ";
let comma = "";
​
function getNameFor(member){
   let haveAnyNames = member.username&&member.first_name;
   if(!haveAnyNames){ return ""}
​
   return member.username ? ("@" + member.username) : member.first_name
}
​
if(new_members.length > 0){
   for(var i=0; i<new_members.length; i++){
      msg = msg + comma + getNameFor(new_members[i])
      comma = ", ";
   }
   Bot.sendMessage(msg);
}
​
if(request.left_chat_member){
  Bot.sendMessage(
    "Goodbye, " + getNameFor(request.left_chat_member)
  );
}
​
​
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Last modified 3yr ago
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Good morning every day
Greeting all new member