What is Strategy design pattern?

javascript

// Different payment strategies
class PayPalPayment {
  pay(amount) {
    console.log(`Paid ${amount} via PayPal`);
  }
}

class CreditCardPayment {
  pay(amount) {
    console.log(`Paid ${amount} via Credit Card`);
  }
}

class CryptoPayment {
  pay(amount) {
    console.log(`Paid ${amount} via Crypto`);
  }
}

// Context uses strategy
class PaymentProcessor {
  constructor(strategy) {
    this.strategy = strategy;
  }
  
  process(amount) {
    this.strategy.pay(amount);
  }
}

// Usage - choose strategy at runtime
const processor = new PaymentProcessor(new PayPalPayment());
processor.process(100);

Short Answer

Interview ready

Premium

A concise answer to help you respond confidently on this topic during an interview.

Finished reading?

Practice Problems