使用界面创建实例 [英] Create instance using an interface

问题描述

在Angular 2 TypeScript应用程序中，我定义了一个接口而不是一个类来允许可选参数.

In my Angular 2 TypeScript application, I defined an interface rather than a class to allow optional parameters.

据我所知，我应该通过以下方式实现该接口:

As far as I know, I should somewhere implement the interface by:

导出类myClass实现myInterface {...}

export class myClass implements myInterface { ... }

，然后通过new(...)实例化它.

我想知道这是正确的方法(在Angular 2中)还是有更简单/更好的方法?

I wondered whether this is the right way to do it (in Angular 2) or there is a simpler / better way?

此外，我应该在哪里将实现放在中，放在我使用它的组件(.ts)中，接口在哪里或在哪里?

Also, where should I put the implementation, in the component (.ts) where I use it, where the interface is or where?

推荐答案

您可以这样做.您还可以创建一个实现如下接口的对象:

You can do it that way. You can also just create an object that implements the interface like:

interface foo {
    one: number;
    two: string;
}

const bar: foo = { one: 5, two: "hello" };

如果要使用一个类，可以将其放在所需的位置.如果它与组件紧密耦合，则可以将其放置在那里.通常，虽然我希望类之间可以松散地耦合，所以我将它们放在自己的文件中.

If you want to use a class, you can put it where you want. If it's tightly coupled with the component, you can put it there. Generally though, I want classes to be loosely coupled, so I put them in their own file.

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