Creating TypeScript Classes - Defining a Collection of Objects as a Class Property

I'm trying to figure out the best approach for declaring an array of objects as a property in TypeScript when defining a class. I need this for a form that will contain an unspecified number of checkboxes in an Angular Template-Driven form.

Should I create a separate class for the objects, like I've done below, or is there a more efficient method? I've searched extensively for guidance on this but haven't found much. Am I completely missing the mark here?

export class Companion {
    id: string;
    name: string;
    chosen: boolean;
}

export class ExampleForm {
    name: string;
    email: string;
    companions: Companion[];
}

Answer №1

Instead of using classes for models in Typescript (not just Angular), most people opt for interfaces. In the case of your ExampleForm, it would be structured like this.

export class ExampleForm{
    // Retaining your original setup
    companions: Companion[];
}

Next, an interface is used to define the structure of Companion.

export interface Companion{
    id: string;
    name: string;
    chosen: boolean;
}

This approach allows for the use of plain JavaScript objects for Companions while still ensuring type safety for each object. It adds a level of robustness to your code.

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