Quick Reddit Message Alert

snippet.js

var lastMessageId = '';
(function loop(){
$.getJSON('https://www.reddit.com/message/inbox.json',function(result){
  var lastId = result.data.children[0].data.id;
  if (lastMessageId !== lastId ) {
    if (lastMessageId) {
      alert('New message received');
    } else {
      console.log('Listening for new messages');
      console.log('Last message id:', lastId);
    }
    lastMessageId = lastId;
  }
  setTimeout(loop, 5 * 60e3);
})}());