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mildronize/demo1.ts

Created September 8, 2024 03:30
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Type-safe Adapter Pattern in TypeScript
Raw
demo1.ts
export interface PaymentAdapterBase {
pay(amount: number): void;
}
export class PayPalAdapter implements PaymentAdapterBase {
pay(amount: number): void {
console.log(`Pay amount ${amount}$ with PayPal`);
}
}
export class StripeAdapter implements PaymentAdapterBase {
pay(amount: number): void {
console.log(`Pay amount ${amount}$ with Stripe`);
}
}
class PaymentProcessor {
constructor(protected readonly payment: PaymentAdapterBase) { }
pay(amount: number) {
this.payment.pay(amount);
}
}
const payment = new PaymentProcessor(new PayPalAdapter());
payment.pay(100);
Raw
demo2.ts
export interface PaymentAdapterBase {
paymentMethod: string;
pay(amount: number): void;
}
export class PayPalAdapter implements PaymentAdapterBase {
paymentMethod = 'PayPal';
pay(amount: number): void {
console.log(`Pay amount ${amount}$ with PayPal`);
}
}
export class StripeAdapter implements PaymentAdapterBase {
paymentMethod = 'Stripe';
pay(amount: number): void {
console.log(`Pay amount ${amount}$ with Stripe`);
}
}
class PaymentProcessor {
constructor(public readonly payment: PaymentAdapterBase) { }
pay(amount: number) {
this.payment.pay(amount);
}
}
const paymentProcessor = new PaymentProcessor(new PayPalAdapter());
paymentProcessor.pay(100);
const paymentMethod = paymentProcessor.payment.paymentMethod;
// ^?
Raw
demo3.ts
export interface PaymentAdapterBase<TPaymentMethod extends string> {
paymentMethod: TPaymentMethod;
pay(amount: number): void;
}
export class PayPalAdapter implements PaymentAdapterBase<'PayPal'> {
readonly paymentMethod = 'PayPal';
pay(amount: number): void {
console.log(`Pay amount ${amount}$ with PayPal`);
}
}
export class StripeAdapter implements PaymentAdapterBase<'Stripe'> {
readonly paymentMethod = 'Stripe';
pay(amount: number): void {
console.log(`Pay amount ${amount}$ with Stripe`);
}
}
class PaymentProcessor<TPaymentMethod extends string> {
constructor(public readonly payment: PaymentAdapterBase<TPaymentMethod>) { }
pay(amount: number) {
this.payment.pay(amount);
}
}
const paymentProcessor = new PaymentProcessor(new StripeAdapter());
paymentProcessor.pay(100);
const paymentMethod = paymentProcessor.payment.paymentMethod;
// ^?
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