Roll command

client.on ('message', async (revolution) => {
  if (!revolution.guild || revolution.author.bot) return false;
  var prefix = '!';
  if (revolution.content.startsWith(prefix + 'roll')) {
    var args = revolution.content.split(' ') [1];
    if (!args) return revolution.channel.send('ارسل رقم');
    if (isNaN (args))return revolution.channel.send('ارسل ارقام فقط');
    if (args < 1) return revolution.channel.send('يجب اختيار رقم فوق 0');
    revolution.channel.send (Math.floor (Math.random() * args));
  }
})
//By Rashwan || Revolution Codes