Utilize a vacant implementation of an interface

I have a simple interface called EmployerContact. I'm wondering how I can create an empty object, mockEmployerContact, of type EmployerContact and then assign values to its properties later on. Do I need to start with default values for this object?

export interface IEmployerContact {
  lastName: string;
  email: string;
}

...

mockEmployerContact: EmployerContact;

getEmployerContact() {
  this.employerService.GetEmployerProposalDetailsFromId(this.employerId, true).subscribe(data => {
    this.mockEmployerContact.lastName = data.lastName;
    this.mockEmployerContact.email = data.contactEmail;
  });
}

Answer №1

When designing your interface, make sure to specify the properties that are required and those that can be filled in later. For example, if you want to set lastName and email as optional properties, you can do so using this syntax:

interface IEmployerContact { lastName?: string; email?: string }

It's important to note that TypeScript does not provide support for default properties on interfaces.

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