How to implement inheritance in this case in Typescript

Question

my problem is that I want that Product class implements both classes [Review and Category] to get more scalability in my code. However, I got stuck in that. I tried to use even Mixins but I had to re-assign all methods from Category and Review, Does anyone knows a better and smart solution to do so?

interface Fetch {
    getInfo() :string;
}

class Review implements Fetch {

    getInfo(): string {
        return 'Nice Product'
    }

    getName(): string {
        return 'Shirt Star wars'
    }

    geRate(): string {
        return '5 stars'
    }
}

class Category implements Fetch {

    getInfo(): string {
        return 'Nice Category'
    }

    getCategory(): string {
        return 'Geek'
    }

    getSimilar(): string[] {
        return []
    }
}

class Product extends Review {
    constructor() {
        super();
    }
}

let Shirt = new Product()

Shirt.getInfo()
Shirt.geRate()

How about CategoryInterface and ReviewInterface, now implement them in Category and Review, while both in Product ? — Avezan
– Avezan, Commented Jun 10, 2018 at 23:43

Avezan · Accepted Answer · 2018-06-11 01:12:19Z

2

Here is an example of what you have asked:

interface Fetch {
    getInfo() :string;
}

interface ReviewInterface extends Fetch{

    getName(): string;

    getRate(): string;
}

interface CategoryInterface extends Fetch{


    getCategory(): string;

    getSimilar(): string[];
}

class Review implements ReviewInterface {

    getInfo(): string {
        return 'Nice Product'
    }

    getName(): string {
        return 'Shirt Star wars'
    }

    geRate(): string {
        return '5 stars'
    }
}

class Category implements CategoryInterface {

    getInfo(): string {
        return 'Nice Category'
    }

    getCategory(): string {
        return 'Geek'
    }

    getSimilar(): string[] {
        return []
    }
}

class Product implements ReviewInterface, CategoryInterface {
    constructor() {
        super();
    }

    // .... Here goes all implementations...
}

let Shirt = new Product()

Shirt.getInfo()
Shirt.geRate()

edited Jun 11, 2018 at 1:12

answered Jun 11, 2018 at 1:02

Avezan

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4 Comments

Luan Fagundes Over a year ago

Is this case inheritance over composition?

Luan Fagundes Over a year ago

I mean that, composition over inheritance. hahaha

Luan Fagundes Over a year ago

Right, make lot of sense this implementation and looks like mixins but my class Product must implement all interface methods. I mean, despite the relation between classes is not bad re-implement the same methods of Category class inside Product class again?

Avezan Over a year ago

Is category to product 1 on 1 relation? If yes then this will be overkill. But AFA I think it should inherit Review not Category.

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