Getting Started with TypeScript: Includes Introduction to Angular by Huber Thomas Claudius

Author:Huber, Thomas Claudius [Huber, Thomas Claudius]
Language: eng
Format: epub
Publisher: UNKNOWN
Published: 2017-02-03T16:00:00+00:00

id: number;

}

Listing 7.12: 07\05_genericConstraints\main.ts

With the interface defined, you can use it on the generic type parameter with the extends -keyword like in listing 7.13.

class GenericRepo<T extends IHaveId > {

private _items = new Array<T>();

getById(id: number) {

return this._items.filter(item => item.id === id)[0];

}

...

}

Listing 7.13: 07\05_genericConstraints\main.ts

Now the GenericRepo<T> -class only works with types that have an id -property, like for example the Friend -class of listing 7.14.

class Friend {

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