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const a = { prop: 'haha' };
console.log('prop => ', a.prop); // haha

a.prop = 'hihi';
console.log('prop => ', a.prop); // hihi

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const a = 'haha'; // a = 'haha'
a = 'hihi';       // Assignment to constant variable

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var a = 'hacker'; // a = 'hacker'
var a = 'moon';   // a = 'moon'

let b = 'hacker'; // b = 'hacker'
let b = 'pinky';  // Identifier 'b' has already been declared

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if (true) {
  console.log('a => ', a); // undefined
  console.log('b => ', b); // b is not defined

  var a = 'hacker';
  let b = 'pinky';
}

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if (true) {
    var a = 'hacker';
    let b = 'moon';

    console.log('a => ', a); // hacker
    console.log('b => ', b); // moon
}

console.log('a => ', a); // hacker
console.log('b => ', b); // b is not defined

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class Rational(n: Int, d: Int) {
  require(d != 0)
  private val g = gcd(n.abs, d.abs)
  
  val number = n /g 
  val denom = d / g
  
  def this (n: Int) = this(n, 1)
  
  def + (that: Rational): Rational = 

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class Rational(x: Int, y: Int) {
  require(y != 0, "denominator must be nonzero");

  def this(x: Int) = this(x, 1)

  private def gcd(a: Int, b: Int): Int = if (b == 0) a else gcd(b, a % b)
  private val g = gcd(x, y)
  def numer = x / g
  def denom = y / g
  

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Blog Post

(by @hckrmoon)

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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.

---

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export default function combineReducers(reducers) {
  var reducerKeys = Object.keys(reducers)
  var finalReducers = {}
  for (var i = 0; i < reducerKeys.length; i++) {
    var key = reducerKeys[i]
    if (typeof reducers[key] === 'function') {
      finalReducers[key] = reducers[key]
    }
  }
  var finalReducerKeys = Object.keys(finalReducers)