How can we implement a TypeScript interface that includes a constructor?

Question

How can we implement a TypeScript interface that includes a constructor?

Currently, I am exploring an angular maps library that provides the following interface:

export interface LatLng {
  constructor(lat: number, lng: number): void;
  lat(): number;
  lng(): number;
}

To utilize this interface and create an object for API usage, I'm seeking guidance on how to implement it effectively. Any suggestions?

angular google-maps typescript

Answer 1

Answer №1

Although I haven't had personal experience with this particular library, if you are certain that you need to create an object like this on your own, consider using the following approach:

function generateCoordinates(latitude: number, longitude: number): Coordinates {
    return {
        latitude: function() {
            return latitude;
        },
        longitude: function() {
            return longitude;
        }
    } as Coordinates;
}

let pointA = generateCoordinates(0, 0);
let pointB = generateCoordinates(10, -10);

Implementing the interface directly may require casting an object to match the Coordinates type due to the presence of the constructor element, which should ideally be included in the static definitions for the type.

Answer 2

Although I haven't had personal experience with this particular library, if you are certain that you need to create an object like this on your own, consider using the following approach:

function generateCoordinates(latitude: number, longitude: number): Coordinates {
    return {
        latitude: function() {
            return latitude;
        },
        longitude: function() {
            return longitude;
        }
    } as Coordinates;
}

let pointA = generateCoordinates(0, 0);
let pointB = generateCoordinates(10, -10);

Implementing the interface directly may require casting an object to match the Coordinates type due to the presence of the constructor element, which should ideally be included in the static definitions for the type.

Answer 3

Answer №2

Have you considered creating a custom component or class for this specific functionality?

@Component({
    selector: 'CustomComponent',
    styleUrls: ['./CustomComponent.component.css'],
    template: '<textarea>{{info?.name}}:{{info.id}}</textarea>'
})
export class CustomComponent implements Coordinates {
   latitude:number;
   longitude:number
   constructor(lat: number, lng: number){
   }
   getLatitude(){
      return latitude;
   }
   getLongitude(){
      return longitude;
   }
}

You can then use it in the following way:

new CustomComponent (0, 0);

Answer 4

Have you considered creating a custom component or class for this specific functionality?

@Component({
    selector: 'CustomComponent',
    styleUrls: ['./CustomComponent.component.css'],
    template: '<textarea>{{info?.name}}:{{info.id}}</textarea>'
})
export class CustomComponent implements Coordinates {
   latitude:number;
   longitude:number
   constructor(lat: number, lng: number){
   }
   getLatitude(){
      return latitude;
   }
   getLongitude(){
      return longitude;
   }
}

You can then use it in the following way:

new CustomComponent (0, 0);

How can we implement a TypeScript interface that includes a constructor?

Answer №1

Answer №2

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