DoctorDerek

const string = "🍌,B,A,N,A,N,A,S"

// .split() searches for a pattern
const array = string.split(",")

// Here, "," is the separator string
console.log(array)
// true

// .join() is the same as .join(",")

DoctorDerek

const myObject = { "hello Bill": "👋" }
myObject.helloWorld = "🌎"
console.table(myObject)
// (index)    Value
// hello Bill "👋"
// helloWorld "🌎"
try {
  // console.log(myObject.hello Bill)
} catch (e) {
  console.log(e)

DoctorDerek

const date1 = new Date("3005-01-01 00:00") // Happy New Year! 🎉🎈🎊🥳
console.log(date1)
// Output: Date Tue Jan 01 3005 00:00:00 GMT-0500 (Eastern Standard Time)

// The date2 object will have a different object reference.
const date2 = new Date("3005-01-01 00:00") // Happy New Year! 🎉🎈🎊🥳

// The date3 variable will have the same object reference as date1.
const date3 = date1

DoctorDerek

// Typically, you access key with . dot syntax.
const emptyObject = {}
const objectLiteral = { key: "value" }
emptyObject.key = "value"
// These two objects now have the same contents.

// With emojis, you need to use square brackets.
const emptyObject2 = new Object()
const emojiObject = { "⭐": "💫" }
emptyObject2["⭐"] = "💫"

DoctorDerek

const object = { zero: "0️⃣" }
const array = ["⛳"]
console.log(object.zero) // 0️⃣
console.log(object["zero"]) // 0️⃣
console.log(array[0]) // ⛳
object["one"] = "1️⃣"
object.two = "2️⃣"
array[1] = "🏌️‍♂️"
array[2] = "🎱"
console.log(object.one) // 1️⃣

DoctorDerek

const object1 = { "💐": "🌹" }
Object.defineProperty(object1, "👟", { enumerable: false })
object1["👟"] = "🆒"
object1[Symbol("🥞")] = "😋"
console.log(Object.keys(object1).length) // 1
console.log(Object.keys({}).length) // 0

const object2 = { "💐": "🌹" }
Object.defineProperty(object2, "👟", { enumerable: false })
object2["👟"] = "🆒"

DoctorDerek

// Read in old localStorage
const pizza = JSON.parse(localStorage.getItem("pizza"))
if (!pizza) {
  console.log("No pizza was found in localStorage.")
  console.log("Let's save {pizza: '🍕'} to localStorage.")
  console.log("Your slice of pizza will be waiting for you!")
  // You can't save the object directly to localStorage:
  // window.localStorage.setItem('pizza', {pizza: "🍕"})
  // Instead, call JSON.stringify() on the object first:
  const freshPizza = JSON.stringify({ pizza: "🍕" })

DoctorDerek

// Every symbol created with Symbol() is unique.
console.log(Symbol() === Symbol()) // false
console.log(Symbol("✨") === Symbol("✨")) // false

// Calling Symbol.for() makes a global symbol.
console.log(Symbol.for("✨") === Symbol.for("✨")) // true

// You can check for a symbol using typeof.
console.log(typeof Symbol()) // "symbol"

DoctorDerek

const myObject = { key: "🍫" }
myObject.key2 = "🍬"
myObject.key3 = "🍭"
console.log(delete myObject.key)
myObject.key2 = undefined
console.table(Object.entries(myObject))
// (index) key  value
//    0    key2 undefined
//    1    key3 🍭

DoctorDerek

const myArray = [2, 1, "🎊", "✨", true, false, false, true, "✨", "🎊", 1, 2]
const mySet = new Set(myArray)
const uniqueValues = Array.from(mySet)
console.log(uniqueValues)
// Output: Array(6) [2, 1, "🎊", "✨", true, false]

// Using the ... spread operator is the same as Array.from():
console.log([...mySet])
// Output: Array(6) [2, 1, "🎊", "✨", true, false]