Complex Typescript Interface with Objects

Question

I have an interface defined as:

export interface Address {
    addressType: {
        house?: {
            streetAddress: string,
            city: string,
            zip: string,
        },
        apartment?: {
            streetAddress: "",
            unitNumber: "",
            city: "",
            zip: "",
            buildingName?: "",
        },
    }
    instructions?: string;
}

Then in my Typescript file of my component, I am defining a house address:

address: Address;

constructor() {

    this.address.addressType = {
      house: {
        streetAddress: "1 test",
        city: "test city",
        zip: "92222",
      }
    }        
    console.log(this.address);
}

Though when I log the address to the console, I get:

Uncaught (in promise): TypeError: Cannot set property 'addressType' of undefined

I thought I was setting the addressType in the constructor. Is there a more efficient way to do what I'm doing?

Answer 1

You need to initialize this.address before you can set its addressType:

constructor() {

    this.address = {
      addressType: {
        house: {
          streetAddress: "1 test",
          city: "test city",
          zip: "92222",
        }
      }
    };        
    console.log(this.address);
}