Create a variable of certain type in typescript

Question

I am trying to create variable in my component of certain type like below.

myrequest.model.ts
export class MyRequest {
    public endValue: string;
    public yearEnd: string;
}

In my component i import the above and do like below

myReqObj: MyRequest;

But if i try to do like

this.myReqObj.endValue = '23'

it trows a error like myReqObj is undefined. Am i doing the right way? What is the right way to do this.

Kai · Accepted Answer · 2017-07-18 17:18:18Z

3

Looks like you need to instantiate MyRequest. If you add a constructor, you can do this:

myReqObj: MyRequest = new MyRequest(null, null);
this.myReqObj.endValue = '23'

edited Jul 18, 2017 at 17:18

answered Jul 18, 2017 at 17:15

Kai

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Comments

Aravind · Accepted Answer · 2017-07-18 17:33:32Z

2

You should be defining the value as

this.myReqObj ={
      endValue : '23'
}

Updated : Use interface for custom types like these.

export interface MyRequest {
    endValue: string;
    yearEnd: string;
}

edited Jul 18, 2017 at 17:33

answered Jul 18, 2017 at 17:14

Aravind

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3 Comments

Hacker Over a year ago

Am i doing the things in right manner i.e. creating a class and trying to create a variable of that type or should i create a interface? Am following best practice?

Aravind Over a year ago

you should be using the best practice (using interface)

Hacker Over a year ago

Just a question. Why it should not a class?

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