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That's a nice well-written article with good points.

Software Dev Team Lead

Here's a Software Dev Team Lead's way of doing this: No need to even determine the type. Instead the type implements the correct method for itself & there is never a need to even know the base type. Strategy pattern. 😎🤓

Try The Code

Try the code out and see it run at: stackblitz.com/edit/typescript-xibe8j

interface Animal{
  Speak();
}

class Cat implements Animal{
    Speak(){
      alert("meow");
    }
}

class Dog implements Animal{
  Speak(){
    alert("woof");
  }
}

class Lion implements Animal{
  Speak(){
    alert("roar!");
  }
}

let a : Animal = new Dog();
a.Speak(); // woof

let allAnimals = [];
allAnimals.push(new Dog());
allAnimals.push(new Lion());
allAnimals.push(new Cat());
allAnimals.push(new Lion());

allAnimals.forEach( a => a.Speak());