TypeScript のオブジェクト志向練習

gistfile1.txt

interface IGreeter {
  greet(): string;
}
class NameGreeter implements IGreeter {
  constructor(public name: string) {}
  public greet(): string {return this.name}
}
class CountGreeter implements IGreeter {
  private count: number = 0;
  public greet(): string {return this.count++ + "th";}
}
var ng = new NameGreeter("John")
var cg = new CountGreeter()
function greetLog(greeter: IGreeter) {
  console.log(greeter.greet())
}
greetLog(ng)
greetLog(cg)
greetLog(cg)
greetLog(cg)