random.js

function verifyMinAndMax(min, max){
  if(!min||!max){
    Bot.sendMessage('Need pass min and max for random value');
    return
  }
  if((typeof(min)!='number')||(typeof(max)!='number')){
    Bot.sendMessage('Min and max must be Number type');
    return
  }
  if(min>max){
    Bot.sendMessage('Max must be creater then min');
    return
  }
  return true;
}

function rndFloat(min, max){
  if(!verifyMinAndMax(min, max)){ return }
  return (Math.random() * (max - min + 1)) + min
}

function rndInt(min, max){
  if(!verifyMinAndMax(min, max)){ return }
  return Math.floor(rndFloat(min, max))
}

publish({ 
  sendMessage: function (messages){
    var err_msg = 'need pass messages array. E.g: [\"Hello\", \"Hi!\"]';
    if(!messages){
      Bot.sendMessage(err_msg); 
    }
    if(!messages.length || messages.length==0){     
      Bot.sendMessage(err_msg);
    }

    let random_int = rndInt(0, messages.length-1);
 
    Bot.sendMessage(messages[random_int]);
  },

  randomInt: rndInt,
  randomFloat: rndFloat
})