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interface Person {
  firstname?: string, // optional parameter with `?`
  lastname: string
}

function greeter(person: Person) {
  return 'Hello, ' + person.firstname + ' ' + person.lastname;
}

var user = { firstname: "Jane", lastname: "User" };

document.body.innerHTML = greeter(user);

// Function types
interface SearchFunc {
  (source: string, subString: source): boolean;
}

var mySearch: SearchFun;
mySearch = function (src: string, sub: string) {
  var result = src.search(sub);
  if (result == -1) {
    return false;
  } else {
    return true;
  }
}

// Array types
interface StringArray {
  [index: number]: string; // index can have `string` or `number` type
}

var myArray: StringArray;
myArray = ['Bob', 'Fred'];


// Class types
interface ClockInterface {
  currentTime: Date;
  setTime(d: Date);
}

class Clock implements ClockInterface {
  currentTime: Date;
  setTime(d: Date) {
    this.currentTime = d;
  }
  constructor(h: number, m: number) { }
}

// =======================

interface ClockStatic {
  new (hour: number, minutes: number) {}
}

class Clock {
  currentTime: Date;
  constructor(h: number, minutes: number) {}
}

var cs: ClockStatic = Clock;
var newClock = new cs(7, 30);

// Extending interface
interface Shape {
  color: string;
}

interface PenStroke {
  penWidth: number;
}

interface Square extends Shape, PenStroke {
  sideLength: number;
}

var square = <Square>{};
square.color = 'blue';
square.sideLength = 10;
square.penWidth = 5.0;

// Hybrid Types
interface Counter {
  (start: number): string;
  interval: number;
  reset(): void;
}

var c: Counter;
c(10);
c.reset();
c.interval = 5.0;