Typescript ShortHands

//Old way...
class Person {
  
  private first_name: string;
  private last_name: string;
  private age: number;
  private is_married: boolean;
  
  constructor(fname:string, lname:string, age:number, married:boolean) {
    this.first_name = fname;
    this.last_name = lname;
    this.age = age;
    this.is_married = married;
  }
}

//New, shorter way...
class Person {

  constructor( private first_name: string,
               private last_name: string,
               private age: number,
               private is_married: boolean){}
}