Ways to create an object of a class

Using constructor: It’s the widely used way of creating objects of a class in most of the programming languages. Based on the need you can overload constructors. See a sample code snippet below.

public class Customer
    {
        private string _firstName;
        private string _lastName;
        private string _email;

        public Customer(string firstName, string lastName, string email)
        {
            _firstName = firstName;
            _lastName = lastName;
            _email = email;
        }
    }

Usage of the above mention code snippet looks like following.

  public class SignUpService
    {
        public Customer SignUp(SignUpRequest signUpRequest)
        {
            return new Customer(signUpRequest.FirstName,
                signUpRequest.LastName,
                signUpRequest.Email);
        }
    }

Using syntax sugar: Programming languages provide many ways of creating an object of a class. Similarly, there is a lot of mapper library available to do this job for us. Most of these options either use reflection or use constructors. AutoMapper(C#) and Object Mapper(Java) are one of the most used libraries for object creation.

A code example of usage of this approach looks like following.

public class SignUpService
    {
        public Customer SignUp(SignUpRequest signUpRequest)
        {
            return Activator.CreateInstance<Customer>();
        }
    }

Using a factory method: In this approach, you can create an object using a factory method and turn off object creation by constructor using a private constructor.

 public class Customer
    {
        private string _firstName;
        private string _lastName;
        private string _email;

        private Customer()
        {
        }
        
        public static Customer SignUp(string firstName,
            string lastName, string email)
        {
            return new Customer
            {
                _firstName = firstName,
                _lastName = lastName,
                _email = email
            };
        }
    }

Usage of the above mention code snippet looks like following.

 public class SignUpService
    {
        public Customer SignUp(SignUpRequest signUpRequest)
        {
            return Customer.SignUp(signUpRequest.FirstName,
                signUpRequest.LastName,
                signUpRequest.Email);
        }
    }

Each of these approaches has its own use cases, pros, and cons. I will publish a comparison between them in an upcoming post soon till then try these in your project and let us your experiences.