Implementing Interfaces
Implementing Interfaces
π¨βπΌ Perfect! Both
CreditCard and PayPal implement the same interface, ensuring
they can be used interchangeably.π¦ The interface defines the contract (
pay() method), and each class provides
its own implementation. This allows different payment methods to work through the
same interface.Interfaces: Classes vs Functions
Interfaces can define contracts for both classes and functions:
// OOP approach - interface with classes
interface PaymentProcessor {
process(amount: number): boolean
}
class StripeProcessor implements PaymentProcessor {
process(amount: number) {
return true
}
}
// FP approach - function type
type PaymentProcessor = (amount: number) => boolean
const stripeProcessor: PaymentProcessor = (amount) => true
Both approaches achieve polymorphismβjust through different mechanisms. The OOP
approach bundles state and behavior; the FP approach keeps functions separate
from data.