Create an object with no specified keys

I am attempting to create an empty object without specifying initial values.

Here is my interface:

interface MyDate {
  day: string;
  month: string;
  year: string;
}

This is my class:

export class MyClass implements OnInit {
  date: MyDate = {}; // Error Type '{}' is missing the following properties ...
  buildDate([day, month, year]: Array<string>) {
    this.date = { day, month, year };
  }
}

To address this issue, I could make the keys optional in my interface:

interface MyDate {
  day?: number;
  month?: number;
  year?: number;
}

Another option is to initialize my object like this:

date: MyDate = {
  day: '';
  month: '';
  year: '';
};

However, I prefer to start with an empty object for aesthetic purposes :)

Answer №1

One way to assign a type to a variable is by using the as statement, although it is generally not recommended.

date: MyDate = {} as MyDate;

Answer №2

If you're looking to have the properties automatically created, simply implement a class

class DateInfo {
  day = '';
  month = '';
  year = '';
}
dateDetails = new DateInfo();
generateDate([day, month, year]: Array<string>) {
  this.dateDetails = { day, month, year };
}

By using this approach, you adhere to the object definition, ensuring that all properties are indeed strings.

Creating an interface with required properties and then creating an empty object will result in undefined properties. Therefore, setting a rule for all properties to be strings only to break it seems unnecessary. Why establish the rule if it won't be followed?

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