Polymorphism

ELI5 — The Vibe Check

Polymorphism means the same method call can do different things depending on which object it's called on. Call 'speak()' on a Dog and you get a bark. Call it on a Cat and you get a meow. Same interface, different behavior. It's shape-shifting for code.

Real Talk

Polymorphism allows objects of different types to be treated uniformly through a shared interface. Runtime polymorphism (dynamic dispatch) selects the correct method implementation at runtime. Enables writing generic code that works with any conforming type without knowing the specific implementation.

Show Me The Code

const animals: Animal[] = [new Dog(), new Cat(), new Bird()];
animals.forEach(a => console.log(a.speak()));
// 'woof', 'meow', 'tweet'

When You'll Hear This

"Polymorphism lets us add new animal types without changing the loop." / "That's the power of polymorphism — same interface, different behaviors."