Typescript: Class within Class

Question

I have a class Moviecharacter which represents json data about movie characters aswell as an actor class which holds information about actors. I want to add the Actor class into my Moviecharacter class without using duplicated attributes:

My versions for Actor and MovieCharacter are:

// actor class stores general information about an actor in a json file
export class Actor{
    name: string;
    id: number;
}

// duplicated attributes name and id:
export class MovieCharacter {
    name: string;
    id: number;
    character: string;
}

But i want something like this:

 // without duplicated Attributes:
export class MovieCharacter {
    Actor(); // not working
    character: string;
}

Any help would be appreciated.

basarat · Accepted Answer · 2016-09-06 23:29:21Z

2

// without duplicated Attributes:

Suspect you are looking for inheritance:

// actor class stores general information about an actor in a json file
export class Actor {
    name: string;
    id: number;
}

// Inherits name and id from Actor
export class MovieCharacter extends Actor {
    character: string;
}

More

Some helpful docs : https://basarat.gitbooks.io/typescript/content/docs/classes.html

answered Sep 6, 2016 at 23:29

basarat

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1 Comment

SirCheckmatesalot Over a year ago

great, inheritance was the thing i was looking for :)

James Amos · Accepted Answer · 2016-09-06 16:27:33Z

1

You firstly need to specify the member as "name : type"

If you wanted to create a new instance of the class on construction you can do the following..

 class MovieCharacter {
    actor: Actor;

    constructor() {
        this.actor = new Actor();
    }
}

edited Sep 6, 2016 at 16:27

answered Sep 6, 2016 at 16:16

James Amos

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