What is the purpose of having a constructor in Typescript when an interface is already used for a class?

Is it necessary to have a constructor in my class if the class already implements an interface? It seems like redundant code to me.

interface PersonInterface  {
    firstname: string;
    lastname: string;
    email: string;
}

class Person implements PersonInterface {

    firstname = "John";
    lastname = "Johnsson";
    email = "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2e64414640004441405d41406e43...
    
    PrintPerson() {
        console.log(`${this.firstname}, ${this.lastname}, ${this.email}`)
    }
}

Answer №1

The Person class is equipped with a default constructor that automatically assigns values to its public properties. A custom constructor is only necessary if you require functionalities beyond what the default constructor offers.

It's important to note that implementing an interface does not dictate the need for a custom constructor. Whether or not your class implements an interface, the decision to include a custom constructor depends on the specific requirements of your code.

Answer №2

When working with typescript, Interfaces are commonly used to ensure that the properties of our class adhere to specific types. While constructors are usually automatically created for you, they can also be customized if necessary. It's important to note that interfaces and constructors serve different purposes in Object-Oriented Programming, so having a constructor is not always necessary when an Interface is implemented with your class.

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