JS Bin // source http://jsbin.com/habicazori

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <script src="https://code.jquery.com/jquery-2.1.4.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/4.0.6/rx.all.js"></script>
  <title>JS Bin</title>
</head>
<body>
  <input id="textbox" />
<script id="jsbin-javascript">
"use strict";

var Observable = Rx.Observable;

var vals = [1, 2, 3].map(function (x) {
  return x + 1;
});

var textbox = document.getElementById("textbox");

var keypresses = Observable.fromEvent(textbox, 'keypress');

keypresses.forEach(function (e) {
  return console.log(e.keyCode);
});

function searchWikipedia(term) {
  var url = "https://en.wikipedia.org/w/api.php?action=query&list=search&srsearch=" + encodeURIComponent(term) + "&callback=?";
  console.log(url);
}

searchWikipedia('Terminator');
</script>

var vals = [1,2,3].map(x => x +1);

var textbox = document.getElementById("textbox");

var keypresses = Observable.fromEvent(textbox, 'keypress');

keypresses.forEach(e => console.log(e.keyCode));

function searchWikipedia(term) {
  var url = "https://en.wikipedia.org/w/api.php?action=query&list=search&srsearch=" + encodeURIComponent(term) + "&callback=?";
  console.log(url);
}

searchWikipedia('Terminator');</script></body>
</html>

https://code.jquery.com/jquery-2.1.4.js

https://cdnjs.cloudflare.com/ajax/libs/rxjs/4.0.6/rx.all.js