gaearon

function mapValues(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    result[key] = fn(obj[key], key);
    return result;
  }, {});
}

function pick(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    if (fn(obj[key])) {

matthewmueller

function *something(msg) {
  msg += yield msg; // yields "a", returns "b"
  msg += yield msg; // yields "ab", returns "c"
  msg += yield msg; // yields "abc", returns "d"
  return msg; // returns "abcd"
}

var gen = something('a');
console.log(gen.next().value);    // a
console.log(gen.next('b').value); // ab

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---