ES6의 정석
ES6, ES7, ES8
#0 Introduction
#1 Variables
#2 Functions
#3 Strings
#4 Array
#5 Destructuring
#6 Rest and Spread
#7 For Of Loop
#8 Promises
#9 Async / Await
#10 Classes
#11 Symbol, Set and Map
#12 Generators and Maps
#13 [🔥2020 Update] ES2020
#14 [🔥2022 Update] ES2021 & ES2022