sample.ts

// Example with nested conditionals (harder to read)
function processUserRegistration(user) {
  if (user.hasValidEmail) {
    if (user.isMinimumAge) {
      if (user.hasAcceptedTerms) {
        if (user.hasProvidedValidPassword) {
          // Perform registration
          return {
            success: true,
            userId: generateUserId(),
            message: 'Registration successful!'
          };
        } else {
          return {
            success: false,
            message: 'Password requirements not met'
          };
        }
      } else {
        return {
          success: false,
          message: 'Terms must be accepted'
        };
      }
    } else {
      return {
        success: false,
        message: 'Must be at least 18 years old'
      };
    }
  } else {
    return {
      success: false,
      message: 'Invalid email address'
    };
  }
}

// Same logic using guard clauses (cleaner and more maintainable)
function processUserRegistrationWithGuards(user) {
  if (!user.hasValidEmail) {
    return {
      success: false,
      message: 'Invalid email address'
    };
  }

  if (!user.isMinimumAge) {
    return {
      success: false,
      message: 'Must be at least 18 years old'
    };
  }

  if (!user.hasAcceptedTerms) {
    return {
      success: false,
      message: 'Terms must be accepted'
    };
  }

  if (!user.hasProvidedValidPassword) {
    return {
      success: false,
      message: 'Password requirements not met'
    };
  }

  // All validations passed, perform registration
  return {
    success: true,
    userId: generateUserId(),
    message: 'Registration successful!'
  };
}

// Helper function  
function generateUserId() {
  return Math.random().toString(36).substr(2, 9);
}

// Example usage:
const user = {
  hasValidEmail: true,
  isMinimumAge: true,
  hasAcceptedTerms: false,
  hasProvidedValidPassword: true
};

console.log(processUserRegistration(user));
console.log(processUserRegistrationWithGuards(user));