Class Specification<T>Abstract

Example

class CustomerIsActiveSpec extends Specification<Customer> {
  isSatisfiedBy(customer: Customer): boolean {
    return customer.status === 'active';
  }
}

class CustomerHasMinimumBalanceSpec extends Specification<Customer> {
  constructor(private minBalance: number) {
    super();
  }

  isSatisfiedBy(customer: Customer): boolean {
    return customer.balance >= this.minBalance;
  }
}

// Compose specifications
const eligibleForLoan = new CustomerIsActiveSpec()
  .and(new CustomerHasMinimumBalanceSpec(1000));

if (eligibleForLoan.isSatisfiedBy(customer)) {
  // Process loan application
}
Copy