Modern Javascript; Intro to VCS and Git

Modern JavaScript

Classes
- Define with class keyword
- Constructor function
- Methods
  - this refers to instance
- extends for derived classes
Exceptions
- create new exception by extending hte Error class
- Exceptions are caught by Promise.catch, as we ll as try/catch blocks
Nested Functions
- can use symbols defined in the outer scope inside the inner function
First-class functions
- use them as arguments: Array.map(fn)
- return them as values
- nested function has access to the scope where it is defined
Arrow Functions
- evaluated to a function
Template Literals with string interpolation
- evaluated in surrounding scope
Module Systems
- CommonJS module system used by NodeJS created in 2009
- Frontend community adopted CommonJS while waiting for version ES6