Y2017

// Le typage TypeScript ne se base pas sur les interfaces mais sur les "Shapes" inspirées du "Duck Typing" Python.
// "If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck."

// If we don't have access to external classes

class User {
    firstName: string;
    lastName: string;
    email: string;
}

Y2017

// this
// JS Function :  Without using the "strict" mode, this refers to the context in which someFunction() was called
// In "strict" mode, this would be undefined, which is slightly less confusing.
// http://jsbin.com/vekawimihe/2/edit?js,console
// When this is used inside an arrow function JavaScript uses the this from the outer scope

// class
class Hamburger {
  constructor() {
    // This is the constructor.