js-vs-ts.md

export class MyClass {
  // Here we're injecting the http service and our own data service
  constructor(http: Http, data:Data){
    this. http = http;
    this.data = data;
    // Here we have to create our own this. reference
  }
}

export class MyClass {
  // Here we're injecting the http service and our own data service
  constructor(
    public http: Http, 
    public data:Data){
    // Now we don't need to add this. 
    // the Public keyword tells typescript 
    // that these are available through out the class as 
    // this.http and this.data
  }
}